Can you update the guide so that instead of the NIP-05 verification being in the format of name@domain.com, it's just domain.com?
Orange Surf did it in his guide here: https://orange.surf/nip05-with-ghost/
If you haven't yet done NIP-05 identity verification, no need to jump on solutions that do it for you.
I've put together the simplest possible self-hosted NIP-05 verification setup I can think of. Just get the cheapest VPS you can, clone the repo, edit 2 files slightly, and run one command and you'll have an always-on, always up-to-date, properly certified NIP-05 identity endpoint:
https://github.com/sethforprivacy/easy-nip5
Detailed steps are all in the readme at the above repo.
Feedback welcome!