Michael, this year I did a couple two queen hives. I did something similar to the Demaree method. In late May I split the double deep and put one or two deeps of undrawn frames between the two, making sure I had eggs and larva in box brood boxes. My goal was to have a two queen hive (it works) and the queens would eventually end up in one box and one would eliminate the other. It would allow me to have a two queen hive during the summer, and an easy way to requeen.
I peeked in the other day and the 4th deep is packed full of brood. If I make sure the queen is in that box, can I split that box from the hive and treat it like a 10 frame nuc? (and bypass the requeening) Or would I be better off just allowing the two queen hive merge into a one queen hive?