yes, this is exactly what I was thinking about, thank you.
It will be non-trivial to integrate, though …
What’s the difficulty?
The handling of such a file inside the context of an application: first I have
to gracefully handle the case when people don't have the text fonts installed,
and second the set-up in that music font dialog doesn't work smoothly with
files having their own \paper blocks inside, which is something I have yet to
find a suitable workaround that is generic enough to work with all reasonable
files.