Re: Honey frames?
If you pull your existing small cell honey from the brood nests you will either have to replace them with foundation or extract them and put them back. Either way they will probably fill the brood nest frames back up before they will move up into boxes full of foundation.
If the brood nests are honey bound - inadequate brood area - because of the old honey, then I would extract it and return the combs for brood. Otherwise I would leave it - you want to end the season with plenty of stores in the brood boxes anyway.
I would assume that since you want small cell brood and 5.1 honey that you will use an excluder. They will go through the excluder to draw foundation during a flow, but not before the brood boxes are Full. You will probably have to cut down swarm cells weekly for a while to accomplish it.
If you were doing all small cell you would have other options.
Don't let what might be best prevent you from doing what will work.