It would seem that the ultimate issue is family. How you view your family. Those that care about their family, and wish to maintain a relationship with them, giving the family an excusable way to maintain contact with them, your best option is to fade. As stated by the many posts on this thread, there are a lot of drawbacks to fading, but it's your best chance of maintaining contact with family.
On the other hand, those who have disassociated seem to have had a disfunctional, if not poisonous, relationship with their families. So disassociating wasn't as big of a deal for them, perhaps a relief, in as much as it serves as a barrier, keeping a toxic family relationship at bay, severing ties with those they no longer want in their life.
OP, you've stated that you couldn't care less about your family, even your marriage. If, after careful consideration this is truly how you feel, then Disassociating sounds like your best choice. Just remember, once that bridge is burned, there's no going back. Be sure that later on in life, you aren't going to look back and miss having contact with anyone. If you had children, I would be very concerned, and caution you to rethink your decision. You can walk away from a marriage, even parents, and be perfectly content not speaking or maintaining a relationship, for the rest of your life. But children... at some point or another, a parent is going to regret severing contact, or disabling their relationship with their child.
I like the idea of sending individual letters to members of the congregation, outlining your thoughts and reasons for leaving. Citing specific instances of hypocrisy and dishonesty by the organization and its leaders, may open some eyes. Try to keep it as brief and to the point as possible, not overstating or repeating yourself. And finally sending your DA letter to the elders, to be recieved a few days after your letters to the congregation arrive. Then you're finished. All done, forever. Good luck to you. Please let us know how it goes!