I don't think you could turn a pedophile into a person that lusts after huge mammaries, but I do think you could grow the age parameters.
Another aspect would be to let the person control the morphing as a way to (perhaps) find core reasons for the attraction -- a sort of "who are you looking for" approach.
I agree that you cannot turn a homosexual into a het or
vice versa (nor would you need to as long as it involves consenting adults), the question is if you can turn predatory behavior into consensual behavior.
(how ya doin?)