On a related note, is there any device out there that lets you create a private key and "burn" it to that device in a way that the key cannot be taken off the

On a related note, is there any device out there that lets you create a private key and "burn" it to that device in a way that the key cannot be taken off the device and you instead use the device the same way you use SSH_AUTH_SOCK? Ultimately, it would be nice to have a way where private keys can not be copied.