at this moment no way to start oowow by usb-keyboard shortcuts like for PC-bios
FUNCTION + RESET - can start oowow - but u can modify hardware just connect one wire which can short both keys same , and take out this special key to your panel ( if u can broke ethernet, hdmi and one USB port, u can easily for u )
PS: maybe another way will be same interesting Enter oowow from cli - #3 by hyphop