Oh I love tailscale, it is so performant and just works (mostly). However, I have used Tor for many years for this use case and still have it around as a fallback for machines that can be hard to reach spatially.
ZFS is not really a 128 bit filesystem, it is merely a 64 bit filesystem that is "128 bit ready". I.e. the on disk format is 128 bit, the kernel drivers are not. At least, they were not until Oracle bought Sun, that's about the last time I really cared about ZFS.