I fail to see the need of an act. I think that there is nothing wrong with an alliance between parties, secret or open. Parties should ally with who they want for any agenda. This alliance gives both the populares and Optimates a chance of implementing and working together. If the table were turned you would defend yourself like I am.
If you make this passed, what about the middle sized party? They will have the least power. The party with the second most votes has less power than the least votes. This is a ridiculous idea. Under these conditions the smaller moderate party would have a position while my party would have to win votes to get ANY power.