I've said all along that the best way to send a message to the UN is to leave the position of Ambassador to the UN vacant. Putting in someone like Bolton, who nobody there is going to follow or listen to anyway, is a waste. But refusing to appoint a representative and instead leaving it in the hands of lower-level staff makes it clear that we don't consider the UN important enough to send someone to deal with them.
I would prefer to start a new discussion society composed of only free societies, and leave the UN to die an unfunded death.