Contrary to what many believe, governments DO care what the public thinks of them. A single letter represents the opinion of hundreds who do not take the time to write. Isolda Oca has already indicated that the United Nations is slightly overwhelmed by the number of requests they are receiving. A web link which addresses the concerns of the Witness community would certainly be easier than trying to respond to individual requests.
The UN could present the information in a neutral manner to (hopefully) not offend the WTBS. Unless, of course, the WTBTS still lobbies the United Nations, informally.
Isolda thinks the solution is as simple as the ex-JW community cycling her letter. She does not understand the extreme paranoia and suspicion built in to the WTBTS community. And Seattle Nice Guy is absolutely correct in that many of these requests could be coming from sincere Witnesses hoping to prove the ex-JW community wrong.
I think this campaign can be a win-win for both the UN and us.