I don't know if anybody noticed #ZeroFS yet, but it seems there is a completely user space-implementation of #NFS and #blockstorage on top of #S3 #objectstorage: https://github.com/Barre/zerofs
Including a demo running #ZFS on top of it which essentially allows geo-redundant ZFS volumes: https://asciinema.org/a/728234 & https://github.com/Barre/zerofs?tab=readme-ov-file#geo-distributed-storage-with-zfs
I don't see no #FreeBSD port yet, but if that really works it would be absolutely awesome.