Hi vikesgirl,
I am interested in the same questions jamiebowers asked you. If your ex has even partial custody of the kids your disassociating yourself will give you even less control over what your children are told about you - I would think. In the protection of the kids perhaps you should just ignore the elders.
If you have full custody of the kids is it possible to move away? Simply leaving and not looking back might be the best solution if it is possible.
My parents know things about me that could get me disfellowshipped if they were to push it. But the annoucement would be crushing to my mother. So I believe they will never out me. And I believe it hurts them less for me to have simply left, moved away, and be inactive than to be disfellowshipped or officially disassociate myself. Plus like JWFacts said I do not recognize their rules as having any authority over me, which means I have walked away from their religion and do not consider myself to be a part of it. I got baptized as a teenager and so it was not legally binding. I do not recognize it. I am simply done with it.
Good luck!
Rachel
Edited to say: I did not see your last post before I submitted mine. I will go back and read that now.