Today I learned, you can have a java(card) implanted into you if you wished to do that for some reason: https://dangerousthings.com/product/flexsecure/
Finally, a GPG/SSH Smartcard that I cannot lose (well, if I do, I have bigger issues)
I mean, it also does not have to be you even, you could have your dog/cat/etc be your SSH key
@benjojo Wait until you/your cat/dog/... leaks private keys...