Setting up NIP5 is easy and takes 2 minutes. Thanks #[0] for the quick guide: https://nvk.org/n00b-nip5
All I can add that I used the https://nstr.cloud/key.html to transform my npub to hex and yes github does complain, but can also use a subdomain.
To make it even faster you can fork this: https://github.com/openoms/nip5

