I think for now that should be fine. I got daily cloud backups, and got a way to remotely turn off the PC if a disk degrades or faults. I might also even get a disk as hot or cold spare just to be sure. With 2 mirrors I got quite a bit of performance, and in a sense better off than with a single mirror.
I’m using the storage to host Nextcloud, and the performance was just not really good enough with a singular disk of speed. I’m hosting it for me and the wife so we can both share pictures with each other without needing a privacy invasive third party :)
I’ll be honest, I never tried it that way. But it should be possible. If you have the possibility, I’d advise to simulate that in a VM, then you’ll know for sure! But basically importing zpools should even be OS agnostic, as it is an open standard that you can just install on any OS. I’ve heard stories about people even migrating pools from core to scale and vice versa, which is going from BSD (core) to scale (debian linux).