This sounds awesome idea. Not sure if there is a technical reason why this could not be done. On the other hand, Windows already has WSL (Windows Subsystem for Linux, is it still called like that?). All antivirus programs would probably go nuts. Windows itself is a restricted system and some things need to be done before booting into Windows. I assume if it was possible, then this would have been done before. At least I never heard about this. The best way is to have a preinstalled Linux on hardware.