The latter is fixed with btcpay NIP05 plugin?
GM
Custodial zap processors are an attack on Bitcoin.
NIP-05 service providers are an attack on Nostr.

Discussion
How are you faring with this, @#[2]?
1.7M sats bounty for this. I'll do it if nobody started yet.
Context: https://github.com/btcpayserver/btcpayserver/discussions/4642#discussioncomment-4975164
I'll throw in 400k sats