Maybe you could put stakes on both sides at each end and attach twine, end to end and use that hold them all up? I don't think it will take too much help to hold them up long enough to get peas from them.
My snow peas can get anywhere from 3-5+' tall. Maybe next year, you can make a taller support ahead of time. Good luck!

Thanks! I think they're going to be ok - a lot of the blooms that are on the damaged stalks have started producing peas - so I will take it as a good sign that all is well!

Don't be surprised if some of the pea pods split a little bit. They still taste normal, but mine did that on some of the early plants I started because they got a little bit damaged. Next year if planting in the same space try doing a dwarf variety. Shorter stems but still produce lots of peas!