Use this Amazon.com: Duttek 2 Pack Dual USB 3.0 Female to USB3.0 Motherboard Female 20 Pin Header Connector Extension Adapter Splitter for PC Motherboard Mainboard (USB3.0 Connector 20 PIN): Industrial & ScientificYou are absolutely right. I didn’t think to look at the block diagram. Now I’m kinda bummed this board does not have sata dom power or internal usb.
or this: Amazon.com: Toptekits 2 Port USB 3.0 A Female Screw Panel Mount to Motherboard 20 Pin Flat Cable Cord by Toptekits 1.6ft/0.5m: Computers & Accessories