if i understand you correctly, you want to swap out all your equipment for mediums?
it might be a little late now but if you are going to add boxes at any time from now on, i'd put the mediums under the deeps to get them built out. honey supers are easier. just super with mediums.
if you want to do it more quickly, you can cut the brood out of the deep frames and rubber band them into the medium frames. i would only do this when a good flow is going on, or early in the spring when you are going to feed.
if you have honey in the brood boxes you can extract and feed it back.
to see how to rubber band the brood comb in, check out the cutout and removal section. there are pictures.