false percs from different families will NOT, NOT, NOT fight to the death. I dont know where this guy got that from, but I wouldnt listen to what he sys any more (JMO).
all clowns can switch gender. they start w/o one, then become male, then female. once they have switched to a different gender they cant go back, female will ALWAYS be females.
its worth a try on the saddlebacks. get the healthiest one you can, but get one small, and keep it isolated in a different container from the female, wait until she has reduced aggression, then add him to the tank.
GOOD LUCK!