remote server encryption and booting

I wonder if it could be possible to have something like a FIDO HSM encryption fob but that operates remotely, ie: boot up a remote server that is waiting for an encryption key - no taps on the yubico - no booting. Not just for the privacy freaks but for anyone who doesn't like servers seized. Want to destroy some drives, just destroy the key. I suppose this would be a good stepping stone to homomorphic encryption.