I hope this isn't breaking any rules. I don't think it is seeing how using these Generic keys are the only way to do a clean install of 8.1 on a system that originally had 8.
In this video I will show you how if you want, you can you use a yubikey to store the generic core and pro 8.1 install keys, to make entering them as easy as a tap!
This method also works really well for storing long passwords for trucrypt volumes / containers or any other type of encryption software. It shows up to any system as just a USB keyboard.