Passthrough to update ESC's.

Describe problem solved by the proposed feature

I would like to be able to update the ESCs while they are connected to the flight controller using passthrough.

Describe your preferred solution

The ability to connect the flight controller to the PC, enable passthrough in Qgroundcontrol, open separate software to update the ESCs, then disable passthrough.

Describe possible alternatives

Current alternatives are to connect the ESC's to a separate flight controller running betaflight/inav/ardupilot/separate hardware and use their passthrough options.

Additional context

I'm mainly a hobbyist, so this may not be an issue for the majority of people using PX4 in research or commercial environments. Or I just don't have the knowledge of how it can be done easier without a passthrough? But, I have seen the issue raised a couple times over the past few years but no direct response on why it was never implemented. Or if it was, how to use it? Maybe I'm missing it?

PX4 / PX4-Autopilot