As for the #3 reason not to do it - I suspect that it would be a wash. There might be a few on the verge of waking up that wouldn't feel they could talk to you after you DA, but there would probably be a few that feel they can talk to you, precisely because you had DA'd and no one would find out that they'd expressed their doubts to you. For someone who's doubting, it's a risk to talk to anyone who's still in on paper, even if they're inactive. I guess it might not be fully the case since you seem to have been somewhat vocal about your issues with the cult, but even so when people start to wake up they're really paranoid a lot of the time.
Also, for your #1 reason to DA - that one doesn't bother me because you're only a JW on their paper. I don't care if they think I'm a JW on paper, with their track record if they put it on paper it can be taken as convincing evidence that it's not true. As long as no one tries to list me as a JW at a hospital or something like that, I don't care.