Access to SBUS port of HereLink AirUnit

hi
I am developing my first copter project and i am using herelink infrastructure (dev env is python).
I assume to read a load of telemetry info from my copter without losing of control or significant delays in joystick commands.

I apply mavlink protocol to send joystick commands to Flight controller as specified on Current Scheme. It works fine to control gimbl, for instance.
But i wonder whether i can send commands from the Joystick to SBUS port of Flight Controller via ethernet connection?

It is about the potential option to reduce the latency of joystick command transmission.
I assume that mavlink protocol transmission could be slower in some cases (large traffic).
I would be grateful for hints.

The current data flow is as follows:

@Michael_Oborne

please have a look at this project