While a nicely comprehensive guide for other topics, and similar to my use of a Yubikey, it looks like it's actually almost entirely separate from what this pos

While a nicely comprehensive guide for other topics, and similar to my use of a Yubikey, it looks like it's actually almost entirely separate from what this post is about: storing a PGP master key on a hardware key, separate from the subkeys (which are likely on a different hardware key), so that it can be more easily used to sign the PGP keys of other people, for web-of-trust purposes. Those topics don't seem to be considered at all in that guide, and are rather less common.