Why do you want to have a queenright hive for finishing queen cells? Couldn't you just let them start and finish in the same hive without moving them, or using a cloake board?
Yes you can let them start and finish in the same hive. The advantage of a Cloake Board is that the hive is still in "production" while still incubating the queen cells. In other words, it takes fewer resources. Some people also feel you get a higher quality queen from a queen right hive.