Hi Bellyman
Yes, I've also considered signing up to Open Studio, but whilst I'm having classical Piano lessons it would be a waste of time, since most of my practice is devoted to classical, and what I do at a variation on an open mic night, which isn't Jazz either.
That said, I have purchased a couple of Peter Martin's "Packs", when they have been in a sale. One for Stevie Wonder and the other Monk. You got videos (of PM), transcriptions of what he plays as well as his analysis. They normally contain 4-6 pieces, and at sale price are great value.
I think my playing is the other way around. I know quite a lot of grammar, but really haven't got much beyond simple sentences!
Cheers