Return disk decryption with Yubikeys

[NotAShelf]

I currently use BTRFS rollbacks to mimic "root on tmpfs" kind of setups, as my systems rarely feature over 16 gigs of ram. The btrfs snapshots are rolled back with the help of a systemd service that mounts and restores the snaphots, which requires systemd in stage 1.

Yubikeys are not supported in stage 1 yet, which messes with Impermanence and my load chain. - systemd stage 1 does not support Yubikeys yet

I need to either switch to tmpfs (unideal) or find a quick solution to impermanence, possibly links and mounts instead of the impermanence nixos module.