Should be possible. I think I’ve red it can be powered with dumb voltage up to 20V.
Maybe with this you could do this.
https://www.amazon.com/Alloet-Adapter-Type-C-5-5x2-1mm-Female/dp/B075T85F8S/ref=sr_1_6?ie=UTF8&qid=1546294017&sr=8-6&keywords=female+power+jack+to+usb+type+c
Wait until @jack or @Stephen agree to do this. I wouldn’t want you to burn up that beautiful board.