I'm using tabs not notes, but I'm assuming/hoping your solution will adapt quite easily.
I wonder if you could use a microphone to listen for the notes in order to get auto-scrolling. Because you know the general timing, you're not searching through the entire song (likely) but honing down on the exact point that person is at. An inobtrusive metronome might be nice to.
Congats! One of the best projects I've seen in a long time, and particularly such a good use case for the early stage of this hardware.
With that being said, although lilypond is very intelligent about all sorts of typesetting minutiae, but it's probably difficult to wrangle it to run on smart glasses.
[1] https://lilypond.org/doc/v2.24/Documentation/essay/engraving...
I've found the display capabilities of the current gen smartglasses pretty disappointing. Yes they're less obtrusive, but the resolution is pitiful. I've found the Vufine a lot more useful, if more ridiculous looking.
docker run -d -p 8080:8080 -e DOCKER_ENABLE_SECURITY=false --name stirling-pdf frooodle/s-pdf:latest
Lots of features, OP you should definitely check this out