I was looking for the best way to do this with the least amount of expense and effort -- ok, I'm cheap and lazy. I guess I could just remove all the queens and let them raise new ones. That may help with population control during the midsummer dearth.
But could you just remove the queen from one hive and, assuming they will grow more than one queen cell, put one of these queen cells in each hive to be requeened? Actually, instead of trying to cut out queen cells and leaving holes in the comb, could you just drop the entire frame with the new queen cell(s) in the hive to be requeened (a day or two after removing the old queen)?
None of my current queens really seem to be superior to any of the others so genetics really isn't a factor.
Do the queen cells need to be capped before moving or will the hive to be requeened (and queenless) pick up in queen cell development where the first hive left off?