Arduino+ OpenTx for FPV seat

[Rc152]

Hey Friends,

I'm working on my first Arduino project; I want to control my FPV RC airplane by external custom-made joystick, pedals, and throttle ( 4 Potentiometers + 1 switch) the system will include the Fatshark Trinity head tracker to control the camera gimbal onboard, this head tracker is outputting ppm.
My goal is to output these inputs as 8CH PPM by the Arduino direct to My Frsky X9D remote control via mono cable.

Would it be possible to do it with OpenTx? or maybe someone made Arduino sketch for a similar system?