> fancy pants filesystems that support snapshots simplify this situation. This is what I used. zfsbootmenu is an EFI executable with support for doing zfs roll

> fancy pants filesystems that support snapshots simplify this situation. This is what I used. zfsbootmenu is an EFI executable with support for doing zfs rollbacks (and any other arbitrary zfs command) so as long as my EFI partition is left untouched, I don't need a livecd or another partition or anything.