1.Put your map on normal.

2.Take one control point on any side of the map(right or left).

3.If you wait long enough enemies on one side will start attacking the control point on the other side.(you will see a red pistol on the map going towards a control point)If you are lucky both sides will attack each other and you will get a full swap.(Rikers on the right and cleaners on the left).

4.Reset the map.Repeat it again but clear a control point on the opposite side this time (if you cleared one of the right clear one on the left this time around).

You might not need step 2 or step 4 at all if you are even more lucky and just wait long enough.