If anyone want's to try it I would suggest that you first read the "rules" so you can play their "game".
Then you could go to the elders with a story (if it is fabricated or not wont matter). You can tell them that you where watching porn before during and after your baptism, you can say that you are distraught because you know deep down you never really got baptized and you hate living a lie, you never even gave your life to Jehovah in prayer... You just gave in to peer pressure etc.
Then if they decide to "grant your wish" you can start to fade instead of making progress towards your "real" baptism.
It is dishonest I know, but why play by their rules?
I don't know if this works in practice but it think it would have the best chance of working. I don't think bringing up doubt and reasons you don't believe anymore is going to help, that might just reveal the truth, that you are trying to escape without being DFed.