I am using a Nitrokey Pro to store my signing, encryption, and authentication subkeys, they were generated from a master key created on TailsOS and backed up on an encrypted Veracrypt disk stored on a USB key in my safe. (something like this: https://sunknudsen.com/privacy-guides/how-to-generate-and-air-gap-pgp-private-keys-using-gnupg-tails-and-yubikey)

All said and done, it works, but is a pain in the ass :) Honestly, I only use my keys to sign git commits and encrypt files to share with my web of trust network (who also have to be properly set using arcane instructions)

If only there was a better way to generate, backup, recover, and use those keys, in the same way that we manage our BTC wallets. I'll definitely keep an eye on this thread ;)