Nostr, Breez SDK, and Blockstreams Greenlight are very complimentary technologies.

Similar to how you can move between Nostr clients with your nsec, Greenlight can enable you to move your single non-custodial wallet between clients.

https://medium.com/breez-technology/lightning-for-everyone-in-any-app-lightning-as-a-service-via-the-breez-sdk-41d899057a1d