Just a thought but I have a number of song sheets in this format from when I was first starting out up to now where I'm a bit better (not much though). Some I've written myself, some I got from other places where they may have been available a couple* of years ago.
I would not want anything approaching copyright issues to be anywhere near this site, but is there somewhere where I could upload them in this format for others to "use as a teaching aid"?
Possibly a big no no but just thinking outloud
*Edit: ouch.....4 years ago - time flys!!!!