About your last paragraph, have you heard about "mobile lightning nodes"?
I mean, actual nodes, not some LSP powered nodes. Check out Valet Bitcoin wallet.
It is a Lightweight mobile wallet that runs an actual lightweight lightning node on mobile devices. Users can open and close channels, and manage liqudity.
There's also "Hosted Lightning channel", a custodial implementation that enable cheap and seamless onboarding on lightning, without giving up users privacy.
All of these are already implemented on Valet Bitcoin wallet, and this wallet can run on any Android device, as old as Android version 8.
Check out Valet below and share with others:
https://github.com/standardsats/valetDownload and install fromF-Droid, or directly on GitHub. Coming soon on Google and Zaptsore.