I'm now at the point I research parts to see where the LED control is stored.

My keyboard LED is controlled internally without software. My mouse requires software to set, but there is open source rgb control software that was trivial to install and set once, uninstall and forget.

The only one I got wrong was my GPU, which apparently isn't rgb but just has a strip of coloured light beaming at all times.

Thankfully my case isnt mesh everything, so most light is kept inside.