What exactly would be required in order to install a full version on Windows on an Asus Zenfone 2? It has x86 architecture. It would be a dream of mine to be able to play controller compatible windows games on the go. Morrowind, via Open MW, for example does not require a lot of computing power. And supports a joystick if you install it with OpenMW. I just wanted to clarify that before I get a "why would you do that?" post.
Microsoft is working on a version of Windows 10 Mobile that will be compatible with Android phones. Would suggest you simply wait a few months until that's ready, rather than messing with potentially unoptimized and buggy workarounds.