I have created something "almost the same" but different.
I call it zquickinit - it's basically a bash script that generates initramfs - but adds in things like ZFSBootMenu, a proxmox installer, etc. I patched ZFSBootMenu so that I can securely boot/unlock the ZFS root boot, which holds the unlock key for the 2nd stage ZFS data pool.
I did this so that my ZFS install can have 0 keys in it. I use tailscale or ssh to access it in pre-boot mode, enter my key, and continue-on with boot.
I call it zquickinit - it's basically a bash script that generates initramfs - but adds in things like ZFSBootMenu, a proxmox installer, etc. I patched ZFSBootMenu so that I can securely boot/unlock the ZFS root boot, which holds the unlock key for the 2nd stage ZFS data pool.
I did this so that my ZFS install can have 0 keys in it. I use tailscale or ssh to access it in pre-boot mode, enter my key, and continue-on with boot.
Just sharing - Let me know what you think!
https://github.com/midzelis/zquickinit