I guess I am not understanding your problem.
What is wrong with their hybrid freehub body?
My only guess would be that perhaps they are looking for an alternative that allows swapping between 10 and 11 speed Shimano cassettes with less "concentration". Concentration is the best description I can come up with for removing/installing cassettes on the Edco Multisys freehubs. They do take some extra effort to align splines and the cogs are "tight" when pulling them off. If cassettes had to be swapped often in a studio or to support a couple of different bikes at home, I can see where a non-Multisys freehub would be preferred.
Multisys is a cool idea, but the need for Campy compatibility probably isn't high anymore, especially on a freehub that already supports Shimano 11 speed.
With bankruptcy and financing issues it isn't clear what is going to happen with Edco long term. This might impact Tacx and their Neo trainers at some point.