That sounds like a plan . I have 2 Runner drakes with 9 females, The boys don't fight and none of the girls are over mated. This seems to be a good ratio for me. I actually have 3 drakes but my Muscovy drake never messes with the runners and Buffs he has his own Muscovy females. Maybe if you can work it switch the boys out 1X a week so each drakes gets to have time with the females. You could give it a try anyway.