Ok, I will offer both send and withdraw, send payment offline using vouchers, and receive payment offline using a reusable invoice, with split payment & zap forwarding, without internet connection on your end.

The service will be available on zapit in few days. nostr:note1fl4e8hrkanzcr22qe47a9j6s9ydu592595vj4tnvvx0szkjqywkstdx7wc