How to make asymmetric teams with infection style prop hunt?

Hi I have a big problem.
I’m creating a Prop Hunt game. At the start of each round, I want to split players into teams using a 2:1 ratio.
That works fine at game start using the Team Settings device and initial team size ratio.

The problem:
When players join in progress, they are assigned to the Hunter team (which is intentional) and when the props get eliminated they are put into the Hunter team aswell (Infection style). But in the next round, this messes up the 2:1 ratio I have too many Hunters because the initial team size ratio setting only applies at game start, not per round. And rotating teams every round does not help.

Does anyone know a way to fix this and restore the 2:1 ratio at the beginning of each round and make sure that players that were the initial hunters are now props?