Works like a charm. Logged in with browser extension. Saw, that a new user with the role 'subscriber' and with my Nostr name was created. Logged out, logged in as admin, set the new user to admin, logged out. Logged in again with Nostr ... BAM Nostr user is now site admin. Perfect.

Btw, you can say that it's compatible with the plugins "Limit Login Attempts Reloaded" and "WPS Hide Login". I have both on my site, no issues.