Even if that mainstream nostr cleint requires a name, email address, and country of residence to enable? Regardless of whether you can just spoof it, still not ideal.
Discussion
NOT IDEAL BUT CONSIDER THE CUSTODIAL WALLET A PROOF OF CONCEPT.
ONCE MUTINY WALLET NAILS SELF CUSTODY UX I EXPECT THAT TO BE INTEGRATED.
If they can get the Bolt 12 and Nip-5 working like nostr:npub1t0nyg64g5vwprva52wlcmt7fkdr07v5dr7s35raq9g0xgc0k4xcsedjgqv mentioned awhile back. That would be slick UX I believe.