Personally, I find the idea of paying for a dozen models all with their own proprietary accessories galling - especially when the V4 model is already as versatile as I'll ever need. What would be really great is a place where all non-V4 accessories [clothing/hair/props] have been converted from any other proprietary model for easy and convenient use with V4. 

Does anybody have any idea of the logistics and legality of such an idea? I'm more than willing to set the wheels in motion if it's even possible without getting the pants sued off me. Completely on the up-and-up; not willing to do anything shady or unlawful.