I'm an unbaptised born in too.
As long as you are absolutely sure that he is not in any way a believer, his JW past shouldn't be a problem between you. It might even be an asset in your case.
Lots of people have differences with their parents. That doesn't make them less marriageable, especially when those differences are religious.
Sure, it would be really nice if his parents were OK with your 'apostacy' from their silly little cult, but you are not going to marry them.
Seeing as he is unbaptised, his parents don't have any real excuse to shun him and not try to convert him. He can use this to talk to them as long as he remembers ALL of the WTs warnings for identifying 'opposers' and doesn't cross any lines. Gently does it.
If he is just pretending that he is a non-believer and you marry him, I do not see any possibility for a happy future for you both.
I have followed your journey since you joined and much of it had me worried, but this thread is a breath of fresh air. I wish you both well.
Cheers
Chris