You probably need to leave well enough alone. If the males have bonded which seems to be the case, the boys will look for each other and may even grieve. There are no guarantees that either male will re-pair with a female and may seriously injure or kill her. If you give one away, you may need to find a mate and this process will be unending. The best scenario is to leave your pair as is and try to find another mate for the female. Again, there is also the possibility she may not re-pair. The Regal Swan