I'm not the biggest expert on this, but pretty sure you gotta lighting-matize it first as you say. there are a bunch of lightning wallets out there and ways to get BTC on lightning. check https://kycnot.me/ for a full list of services, but a few I know that do BTC to LN are:
and RoboSats which I could only find an onion link for:
http://robosats6tkf3eva7x2voqso3a5wcorsnw34jveyxfqi2fu7oyheasid.onion/