Flying a secondary FC as a 4-in-1 ESC only?

Hello everyone - requesting some help here with ESC configuration. I picked up a Foxeer Reaper AIO V2 without realizing it is a flight controller and not just a 4-in-1 ESC with 5V outputs. Is there a way I can still use it with my Pixhawk Cube Orange for controlling the motors?

The ESC signal inputs would have to available on the board. A look at the wiring diagrams don’t show that they are. And why would they be really…