Cool! I saw this video before, it was amazing!
Yes, the Xkey37 has pedal connections, it will be easy. For USB issue, you may mark the Xkeys and plug them into the USB HUB in a certain sequence each time, so that you always fix them in right number. 😉
By the way, welcome to join our facebook group: https://www.facebook.com/groups/CMEXkeyusers/