I was wondering this too.
I would like to save the seed from our pumpkins and squash but was told that if I grew them together they would get cross pollinated and the saved seed wouldn’t grow true.
You could use hazel sticks for your supports. Find a farmer with a hedge like ours with hazel that was cut a couple of years ago and has now grown thick long stems. These work well, and then I fire them through the wood chipper when they get weak.