You want Valve to develop a version of Steam that circumvents their own DRM to play local files? What would prevent people from using that to pirate things even more easily? I can imagine they'd have some trouble with publishers as well for doing that. There are already largely standardized cracks for steam and emulators for steam; just use that. Regardless, no solution will work for any game using DRM other than Steam, like Denuvo, so you'll have to rely on pirates for those regardless.