I can't imagine why Bolton wanted it in the first place. Withdraw his nomination and then leave the position empty. That will send a stronger message of how the administration feels towards the UN than Bolton could.
Good idea, da**ed good idea!
There's precedent for a major power not having representation at a major Security Council meeting. The Soviets were boycotting the meeting the day the vote was taken to support South Korea following invasion by the North.
Not filling our seat at the UN is an altogether bad idea, although I agree with the sentiment behind the gesture.