Re: Going to all Mediums, My back hurts
Yes, when empty, remove the bottom deep and retire it. Move the top deep down and put medium on top, over an excluder. Make sure the queen is in the top. The next day, move the bottom deep to a new stand, let them raise a queen and get brood going, then sell it as a full single deep hive. Keep adding mediums to the hive you are going to keep. This way you have income to pay for the mediums with frames and new tops and bottom boards you'll need to do all of this. This is what I'm going to be doing here this year, as I also need, like you, to get back to all mediums. I am going to 8 frame mediums, as I now run all 8 frame equipment.
You could also do this, moving both bottom boxes to new stands with top and bottom boards, and let them both raise new queens and sell both of them. Equalize out frames between the two when you move them so they both have equal frames of eggs, open larva, sealed brood, and stores, and empty comb.
Good luck and profits to you.
20+ years, raise my own queens, feed when needed, I treat but have not perfected varroa management yet.