Obviously you are correct that resources in recreational sailing are limited.
But maybe the question is too general-- covers too many variables, like what kind of wing mast, compared to what kind of fixed rig, at what angle of sail. I wonder if you could convince some of your sailing contacts to model a simplified 4 case scenario. Ignore (i) weight, (ii) windage of stays, (iii) effect of jib. Model 2 dimensions only. Assume bolt rope for both. Assume width of mast section is the same-- only difference is that one is D shaped, and fixed, and the other teardrop shaped and rotating.
The cases to be modeled would be close hauled (15 degrees off apparent wind?), and 90 degrees to apparent.
Surely someone on this site can do this in their sleep?