Figured out the pinout on the hot swap board. 10 pin IDC connector just like on your USB motherboard headers.
Time to scavenge a spare USB plug.
Couldn't find any USB motherboard headers so I used a dead ESC lead and two of those tiny motherboard speakers to get enough wires with the contacts already crimped/soldered on. Also managed to desolder the connector from the swap board, but will need some CA or epoxy to keep the pins from falling out of the connector. Both bottles of CA were dried solid, so it looks like I'll have to finish tomorrow.