Just a thought ...
WT1964 p126 para 1 "Did You Make an Acceptable Dedication to God?"
I remember about ten/twelve years ago a CO covering a point about this with our body of elders.
The point made was that if someone had been "seriously" or "grossly" sinning at a disfellowshipping offence level (and obviously kept it hidden) all the way through their dedication and baptism then their baptism could be considered invalid. He said that occasionally, especially if the person was a minor when they were baptised and if they had not become a pioneer or MS or Elder when they were an adult (which might indicate forgiveness and blessing by God - what a joke - ) then their baptism might be annulled and each case would be on a case by case basis.
He said it was extremely rare but that it had happened. This in the UK.
...
So if you could hold it together long enough to get your story straight and you wrote to bethel to say you had been continually e.g. smoking or committing porneia or stealing either side of your baptism you just might get an annulment. Might you just say "I definitely didn't dedicate my life to God, I just did it to please my parents and because of peer pressure."?
However it usually only happened when it suited the branch for example if there is bad publicity like when a jw child abuser can be said to have never been a witness and that would suit the jw hierarchy to put it out that he/she was never really a witness anyway.