Companion MCU parameters

I’m trying to implement some parameters for my companion computer, which is actually an STM32 mcu, without external flash memory.
One way is to use its internal flash, which I am trying to avoid unless someone can really recommend doing so.

So, my effort at the moment is using PX4 to store parameters for me, using a simple module.
I have a set of parameters for the module which can be easily updated from QGC.
My problem now - I want to forward those relevant parameters to the companion computer.
This has 2 parts in it - identify that a relevant parameter was updated, and sending a PARAM_SET message (or forwarding it) to my companion computer.

I’m struggling with last 2 parts. I can’t find resources or examples on how to do so and I’ve been looking for a few days now.

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