Windows Bootable SD card from Android

Does anyone know how to create a bootable SD from Android?

I'm planning to download a win 10 IMG and make the micro SD bootable, but not having much luck...

Otherwise I can go Linux to Windows, but I'd rather go straight to my install.

I'm not sure if you can make a bootable SD, but this app called DriveDroid supposedly allows you to boot straight from an image stored on your phone over USB.