If you can find other pullets (I would recommend at least 2 new birds, if you're allowed to have 2 more) around the same age (8-10 weeks), have ample space for them to work out any differences, and are willing to risk not doing a biosecurity quarantine, you can try adding them directly to the existing pair. Your birds are right at that age where they may still accept new birds with relatively little fuss, though I'd recommend supervising them at initial introduction to make sure things don't get out of control.
One of my mother's roos used to crow at midnight, surprisingly nobody ever complained, but we didn't exactly live in a residential part of town.
