It seems nfs-ganesha which used to have v2 support dropped it since then, but you might be able to compile 1.5.x release tree which is still on github.

As for patched systems, I know I have seen places which had patched images to load from, but there's non-trivial chance that they are slightly bitrotted.

One place is here http://www.jachemich.de/vlm/genera.html

Of course, Portable Genera has official patches for the issues involved.