Bridge Windows games with Wine in the native Linux Steam:
This sounds exactly like PlayOnLinux & Crossover front end for Wine...
But can they make up for lost time that PlayOnLinux has already proven successful?
Its a great idea, but they admit there isn't full permission from Valve and may affect your account & games if Valve decides to kill it.
Its sounds like a great idea... Launching Windows games with LinSteam but behind the scenes its using Wine.
Might as well give it a try... Just create a new Steam account and try it with some free-to-play games just in case Valve want's nothing to do with it.