That sounds like a very reasonable plan then. If your current hive survives the winter I would highly suggest waiting until after the honey flow to do the split. That way you can get some honey and still get your split. a lot of folks do splits as soon as the hive builds up and ruin their chances of a honey crop. I use polystyrene nucs to over winter and really like them. They really retain the heat, and the bees build up much better. good luck...
I'm starting to think that keeping lots of nucs is a good strategy for a sustainable bee yard. I would be interested in hearing input from you and others who actually do it as to why you keep lots of nucs.
Do you keep nucs mostly for backup against loss, a basis for comparison of different queens, source of brood and other resources, general increase - or other strategies?
I know that you rear queens, so I assume that you populate your nucs with the best offspring of your best queens.