I have added a wicked wheel to one of my trucks in the past. Just spin it off and and stick on the new one. If having a complete balance unit was a big issue we would have heard about it with the number of wicked wheels out in service. If I could get a balance unit that is what I would do, if not take what you can get.
1999 F350 AUTO 4x4 CC LB DRW 4.10