Sounds like a good plan.
The thing is, once the not dominant pair is separated they will probably start courting as well 🙂
Female paroes with a ‘husband’ can be quite bullying :).
I had two female harveyi in a tank with one male, and it actually took a long time for me to realize there were two females in there, because one of them lived in the back of the tank in one corner and never came forward.
Food must have gotten her way anyway because she was fine and fit, but not allowed to swim freely around. She is now in another tank with a male 🙂