Sounds like a multisigish setup between your nostr pubkey and Lightning wallet, where your Lightning wallet authorizes signed messages from your nostr pubkey.

Although, it would be nice to extend this functionality to having a non-custodial lightning node on your phone with Eltoo/Daric and many competing LSPs.

Wow!!!! I had no idea there were all these different types of nodes. I a nontechnical user it both facinates and frightens me. Also I’m thyinking that most everyday people including blind and visually impaired users are not going to want to know all this. Such things may need to be abstracted into the background before large scale adoption is possible. Sorry if I’m stating the obvious.