This seems good, but too limited. Why not make it so that wikipedia can only be served over HTTPS?
I remember when the UK censored wikipedia because one page had an image they considered child porn and they transparently redirected the domain to point to a proxy. If they only serve it over HTTP this should hopefully break such a scheme - which isn't the perfect solution (that would be the very painful death of those involved with the censorship), but at least it makes it clear what is happening.