A lot of things are possible with Electrum plugins. Since version 4.6, third-party plugins can be distributed as ZIP files, and installed by users at runtime. Maybe #nostr could be used as a plugin distribution channel? Think of a decentralized AppStore powered by web of trust.
Plugins — Electrum 4 documentation
The next release of Electrum will support 'Submarine Payments', where you pay to an on-chain address using your lightning funds.