How would one replant them?
Air-layering, and I’d imagine that, as with some of the US species that were nearly wiped out, there’s an active breeding project.
https://search.brave.com/search?q=American+Elm+Project
https://search.brave.com/search?q=pawpaw+tree
Dig a very large, complete rootball, and not cut any roots, or expose them to any air until replanted in semi-shade, and watered-in.