

Other options are LUKS with Tang and Clevis, or LUKS with SSH and Dropbear.
Sorry, I have no details.
Edit: Tang/Clevis are local software and a network server that provide keys. If stolen, won’t boot.
SSH and Dropbear make it so you can login to provide keys.
The joke is electricity and Linux.
The real answer is the free hardware.
My main reliable is from 2008? It cannot do modern virtualization due to not having the CPU instruction sets.