I had to dig up some of mine due to getting new siding on house and shed and I cut them back, dug them up and stuck them in big pots where they all sit because DH hasn't finished painting the shed. They've all been fine. I dug them all up in July and August, not the best time but if you keep them watered they should be fine. To climb a lamp post it will need wire or net or string. I have not had good luck with nylon netting or chicken wire. Others have. Wire livestock fence is at Home Depot or feed stores.

When you prune them, you'll have to pull the deer fence down, it will come down or tear when pulling off the pruned vines. At least that is what happens to my bird netting. IMHO wire livestock fencing is the best for Clematis to cling to and also easiest to pull vines down from. I have used bird netting, twine, wood lattice and chicken wire and none of them are ideal. IF I could do it all over again I would use wire livestock fencing. Unfortunately, DH built me huge trellises and topped our fence with lattice... This picture was taken at the Rogerson Clematis Collection where they built multiple trellises like this with wooden frames and wire centers. I've also seen the wire stapled to solid wood fences for Clematis and talked to the owners about it. Much more practical than other methods. Cheap too from Feed/farm/ranch stores.

I don't have a garage or shed (am in a hi-rise but was in a house for years before and do some vertical gardening on my balcony wall), but I do have vines for hummingbirds and recently butterflies have been visiting too (yes I get both up here...lol). Regarding your suggestions, you bring up good points and counter-points regarding trellising against a shed wall. Wood does rot after awhile (even with paint) and metal can rust and crumble after awhile (even with paint). It would be nice if one could find a similar large wall trellis in PVC (I know there are smaller ones that are tall but usually narrow too, but that might be something to think about to use). What I can offer would be like a small scale experience to help describe what the vines you are considering might do and the type of support you might need. Some of the vines that hummers like do include the honeysuckles, but if you choose a native (Loncera sempervirens), then those don't grow as aggressively or are as invasive as the japanese honeysuckle (Lonicera japonica). There are many named varieties of the natives and my hummers couldn't wait until the flowers started opening yesterday and they were all over it. Mine ("Blanche Sandman") is in a pot and supported by a decorative vinyl-coated metal trellis. Interestingly, that honeysuckle seems a bit reticent to twine like other honeysuckles so it would basically mean manually threading it around the support and/or tying them initially until they are on their way. My other honeysuckle - a "Mandarin" (Lonicera x mandarin) does twine quite readily on its own and that is on a small wooden trellis support and yep, the hummers like that one too). But as a note, as a twiner, honeysuckles may have some difficulty going around something too large in diameter, although being woody vines, they do better than the annual vines on wider supports. Similarly, my American wisteria, which is not as aggressive as its asian cousins and as a woody vine, can twine better around a wider support, but the thinner the easier for it. My Blanche Sandman honeysuckle looks like this right now (sorry for the hazy picture but it's hazy here...ugh... this is its 2nd year with me, it was from a 1 gallon size plant that I got last year). These have a tendency for bare bottoms (I have seen larger specimens do similar) with a mass of vinelettes and flowers towards the top (unless you prune to make it bushier - the japanese honeysuckle tends to do the long vines): The SRBs, cypress vines and cardinal climbers have thinner vine shoots and need a finer support to attach to. I have seen some interesting suggestions for that on the large scale where one can string fishing line up for them. Since they are annuals (and the cardinal climber is in the colder areas although they might reseed), and unless you can find white or clear netting, using fishing line might be more aesthetically neutral in winter when the support area is exposed after they die back. The crossvine and trumpet vine are woody like honeysuckle and sortof twine but can become shrubby as well. So for any of the woody vines, a good solid support would be a must. The trumpet vine can get aggressive so unless you are willing to hack it back (I have seen people grow it like a standard), then you might want to reconsider. The crossvine might get that way too, although it's not as aggressive and there are some pretty cultivars out there. If you did decide on clematis (I have one on a cheapy tomato cage) it depends on the type as the group 3s like I have can be cut to the ground every year and will bloom on new growth (meaning for a trellis, it needs to be re-trained each year), whereas the group 1s and 2s maintain a woody structure and require minimal pruning. These attach via their leafs, which wrap around the support, so too thick or wide a support and they can't climb well on their own and they will attach to themselves and then fall over in a tangled mess. But for the ones maintaining a woody structure, if you thread and train the vine (even tie it up), you can shape it permanently. For attaching to a wall, it's probably best to have it on a stand-off (maybe a few inches out) so that you can get behind it and allow the plants to be woven around and through it easier. Plus it keeps the back of the plants off a hot wall and allows some air to move behind. Anyway, hope this helps a little - when I was composing this, I saw a butterfly that I wasn't sure of. Someone from above was looking out for me because I took a WAG and checked a PA butterfly site and immediately ID'd it on a first try as a silver-spotted skipper. I have alot of red flowers blooming up here right now and I guess it saw those and the leaves of my wisteria and maybe thought the wisteria was a locust tree or related (these apparently like pea family plants and the wisteria leaves resemble such): I did have a visit from an Eastern Black swallowtail last weekend: And I'm still trying to get a good picture of my hummers this year but here's a rare one from last year where 2 were sitting not far from each other and had they known the other was there, the mad chase would have errupted (plus you can see my volunteer MGs around the shepherd's hook where the feeder was hung - they did use the MGs as they were closing by the way):

Welcome to the clematis crazy club posie !! :) I also have jolly good , it just came and I can't wait to see what it does . You may enjoy a pretty trellis for those ! I picked some up at hobby lobby and Home Depot this year . My jolly good is on the tallest one they sold , I think 80 inches bit it will flop over as you said . You could use chicken wire if you have it around ! whatever floats your boat , the only thing is wood trellis is usually too thick for it to climb on .