Just put an empty box on newspaper over the queenless hives and add the frames from the nuc. Fill the empty spaces with foundation or drawn frames. You could also catch the nuc queens and introduce them to the queenless hives in a regular queen cage or a hardware cloth cage imbedded into a drawn frame of brood. I make these cages about 4"x5" out of #8 cloth. The advantage of giving them the nuc queens is that the nucs can then make more queens for your future use.