lph, I commuted etc. for over a decade and a half before I got round to doing maintenance classes then wondered why I had waited so long. They were extremely empowering, especially the beginners class, which was an all women class, including the instructors. I'm also a lot more clued up when I go into a shop now. So I think what you're doing is great.

Your list and Sky King's cover most of the skills I use regularly. I would perhaps add a couple more things – how to clean your bike and re-lube and how to change stems/tighten headsets which helps a lot of people to get their bike to fit.