I think that is an interesting way to approach getting a medium coarseness edge. I recently did a little work with it while looking at the edge retention of various grit finishes with a 3Cr13 knife :
If I took the CBN finish for example (Sharpmaker rod) and then started working it with the medium grit rods then the initial sharpness and edge retention would move from the CBN directly towards the medium rod finish. It is a way to basically get an “effective” grit from a a narrow range. However I am not sure that if you had the grits it would not be simpler just to micro-bevel at the intermediate grit. But the two would not be expected to be identical.