Looking at the manual there is an option to do so. https://manuals.fibaro.com/content/manuals/us/FGRGBWM-441/FGRGBWM-441-USA-A-v1.01.pdf
However, all wiring has to come from one location and that includes the power supply…
Secondly you indicate that you have GU10 leds, therfore I assume 220V and not 24V which is required for the RGBW dimmer.
In my opinion. 1,2,3,5 and 6 each with a dimmer 2 and a momentary switch. Add a double momentary switch to the living area to make use of the Dimmer 2 S2 and thereby start your scenes. Item 4 can be done with the RGBW controller, assuming it is 24V.
A bit higher investment, but a more solid solution.
