The only reason I would accept a JC and not DA is to record it for the world to see (albeit a very select audience). During the JC, I wouldn't allow them to put me on the hot seat as I would quickly turn the tables and make them spend the majority of their time trying to defend their policies. Then I would tell them that their religion has apostasized from what it was when i got baptized and leave the room after passing them my letter of intent to DA on the spot. Then, at the next meeting before they made the announcement, I would get up during the meeting and hand each elder my DA letter and tell everyone outloud one or two reasons why I DA'd.
Seems like a good way to go out with a bang no?