Idea : Create a 'pictures of cats' site, and voluntarily put it on the ISPs' 'must be blocked' list.

Then, people that want uncensored internet access can simply state that they liked to get to the innocuous cat pictures site - and that porn access wasn't part of their opt-in reasoning. Minimal-plausible deniability...

Of course, if someone is attacking this plausible deniability thing, then the question is "What do you gain from knowing I dislike censorship?".