So far it seems to be only the two of us, which seems rather surprising. In probabilistic terms, I was assigning a significant probability to receiving N>>1 favorable replies to the suggestion above.

I am quite interested but I know from experience that I study would seem too much like work. I would probably stop doing it until I actually needed to expand my skills for some purpose practical or otherwise.

That being said, I would quite probably follow along with such a group and almost certainly get sucked into answering questions people posed. That changes it from 'homework' to 'curious problem someone put up and I can't resist solving'.