With my kabocha I get pantyhose or any piece of loose cloth, cut them and cover the fruit and tie them on the trellis. As far as training the plant to grow vertically, as soon as I see new growth over 6 inches after planting I will start tying them on the trellis with garden wire and just keep tying them to the top until they are able to support themselves.

I don’t have pics of my kabocha with cloth tied to it but here is the same example I do with my melons.

This is before I tied it with cloth(don’t have a pic of kabocha with cloth)

Hopefully the borers don't get to it this year.. I may start them in the ground late June-early July to avoid them