What would you do in this situation?

I see what you are trying to do but You have to remember Rhodes is a back up and Roy williams will be used in Dallas it may take 1 more week (which I know you don't have) I would look for another defense to start and maybe a kicker Maybe Elam is there he had a bye this past week and someone might have dropped him. If you an only start lynch maybe after the bye you could trade him Good luck