try
If you can't get a keyboard, then you may boot after your install with -s. Follow the two commands listed, and then type nano /System/Library/CoreServices/Setup\ Assistant.app/Contents/Info.plist and edit out(you will have to scroll down) :
<string>DeviceSection</string>
<string>KeyboardTypeSection</string>
Then hit fn + o, enter, and fn + x. Then hit exit.
replace fn with ctrl if needed.