[jb55]

I use a Trezor to store my PGP key. I never have access to the private key, it's generated by a seed which I backup in a cryptosteel protected by a password in my brain (to prevent physical theft). The device only provides an interface to sign and decrypt. This keeps the key safe even if your computer is compromised. See: https://github.com/romanz/trezor-agent

[SoreGums]

all of these need a false/fake entry so when adversaries compel information and you give it to them the result is useless and they have "the truth" and nothing at the same time.

[jb55]

You can do this with Trezor. It allows you to enter a 25th word to your seed when you unlock it (it looks like you're just entering your password, but you could enter any password), generating a whole new set of private keys. Although this makes less sense in the context of a PGP key...