This is what calle's original cashu ecsh did witb npub@cashu.me .. and it was fun but users and devs thought it was a burden to copy the token to redeem the ecsh into a wallet.

Minibits now does this most efficiently by having any zap/send land as ecash in the wallet and also allowing for sending zaps in nostr client with 2 taps. npub.cash offers ln address and all sends the npub are notified via dm. In Amethyst, ecash receives via dm have a beautiful rendering box that allows user to redeem via ine click.