Also, CFAR costs thousands of dollars and is hard to access if you do not have the time or are not living close to a workshop.

I get the impression that non-workshop methods of education, including online classes, are under development, but I don't have a good sense of what they've done already / want to do.

One example that I just thought of, which you may be interested in but not have seen yet, is the (not very accurately named) skill of the week posts.

Should I make an announcement telling everyone to do that, or just make a separate wiki?

No. You personally should make a page about self-improvement articles, and add links to it. In general, and on the internet in particular, implementations are far more valuable than ideas.