Head tracking possible for old JR X9503 radio?

I’m trying to determine if my old X9503 will support a head tracker for FPV (DJI O3 air unit and goggles).

If it is possible, what components do you recommend and how do I connect and configure?

I’m sure the only possible connection through the radio would be with the DSC training port, but you can select only throttle, aileron, elevator, and rudder for slave or master.

If I can change servo assignments around in ArduCopter so that two of those channels are free for head tracking, would that work?