Re: Making deep boxes into medium boxes on an active hive
I overwinter about half of my hives in each of those two configurations, 2D and 1D+2M. Either works, and they both have their advantages and disadvantages.
Can you start with a split? That would be easiest. Otherwise, you could put a QE between the two deeps with the queen and at least some empty comb below, let the brood in the upper deep hatch, then take the upper deep off. Then do what you wish with the frames.
So then, as we have opportunity, let us do good to everyone, and especially to those who are of the household of faith.