Why do they need this "nuclear option?"
All they really have to do is when some silly democRAT raises his/her little hand and chirps "this issue is now under filibuster, all discussion is hereby ended," the presiding chair simply says, OK get up here and filibuster. When you run out of gas, we bring it to a vote. And nobody leaves this chamber until said filibuster quits speaking.
That would be a much simpler change in the rules and would not be "nuclear," but it would be effective.
It would also be according to the procedure as I learned it in Civics class many long times ago.