I don't think you need to pgp sign the note on nostr, since the note is already signed by your nostr key which I trust 😉.
That brings my point the NIP-05 verification is not necessary and even wasteful on accounts you already trust since public-key crypto is more trustworthy and a webserver and DNS.
Since key management is so bad I'd hesitate to trust Nostr keys alone ATM.
GPG provides a useful additional layer that is generally much better secured and thus harder to compromise.
I do like NIP-05, though clients should make it *very* clear when an identity doesn't validate properly.
+1 for PGP second factor.
