Reading about people's "fades," I was just thinking: What would happen if someone who was still regularly attending meetings took the opportunity, in handling an assigned part (ministry school talk?), to announce briefly that they had spent several months investigating the WTS's claims and had come to the conclusion that their conscience, and a course of personal and spiritual integrity, required them to leave the organization. "So I am taking this opportunity to say goodbye, and that I hope that many of you will follow my example in undertaking an honest and open-minded re-evaluation of your faith." - or something to that effect.
One could probably get a few short and pointed sentences like that out before having the mic taken away and being shown the door (especially if the servant body could be taken completely by surprise). For someone with sufficient courage and conviction, it might be a very rewarding way to make one's exit. I know that the circumstances would have to be carefully crafted, and would involve forcing oneself to behave unnaturally for a period of time, but ... can you imagine? What a powerful witness....
Speculatively,
Cruithne