Even if we entertain the possibility that one could create fully-ethically-produced pornography that pedophiles would like (maybe using adult actors that look much younger than they are, or something), there are still some problems.

It’s well known that some people develop fetishes, where they can only orgasm by experiencing their particular kinks. Probably if they had never seen porn that contained these kinks, they wouldn’t have developed into a fetish. So you could imagine someone who’s a half-pedophile, attracted to adults as well as kids, becoming a full pedophile after too much exposure to child pornography. That would be a pretty negative outcome.

Politically though, anything that improves the lives of pedophiles is a complete nonstarter regardless of how many children it saves from being raped. Because if you propose something that improves the lives of pedophiles, everyone will say “hmm, pretty suspicious that this is your pet project, how do we know you’re not a pedophile?”. So the whole discussion is kind of moot.