You could possibly add a lot of weight on both sides of the spinning wheel, so the lost weight of the payload would not matter as much. Or maybe put a weight a

You could possibly add a lot of weight on both sides of the spinning wheel, so the lost weight of the payload would not matter as much. Or maybe put a weight at the opposite end that moves towards the center as you release the payload, compensating for the lost weight at the other end? (* in terms of angular momentum)