I was thinking you could even use this disguise at thier regular meetings, and if you play dumb enough you can even raise your hand and give interesting thought provoking,, but innocent appearing comments to make dubs think and even have a good laugh all the while reeling them in like a fish on the line. But you have to act kind of dense and innocently honest,, and they will let you get away with it. Sorta like the TV detective "Columbo" with rythms with dumbo, which is close to dumb.
At a meeting you could raise your hand for a question on DF'n and say innocently:
I don't know if this is the only true religion like everybody is saying, and I could be wrong, but didn't Jesus say that we wern't suppose to judge people? So I don't think it is right that we should shun anybody, and we should try our best to be kind and good and loving, I think that far better that treating people like dirt and shunning them.
And no doubt the elders would kindly try to readjust you,, and that's where you can play dumb and innocent somemore.