Its a great idea, I wish there was something like this for uk btc users. There used to be, it was called lastbit.io - It linked my lightning node to a prepaid debit card so I could add funds to the debit card by paying a lightning invoice. I think 'striga' which is part of this business, evolved out of lastbit.io. Anything which makes the conversion of btc to gbp frictionless is a win.