Is there a possibility in Siril to mix the RGB channels, like
Photoshop / Channel Mixer
Fitsworks / Color Functions / Color Corrections?
With my ASI 183 MC camera, the green and blue channel are a bit sensitive above 650nm and therefore it is a good solution to subtract some R (20%) from G channel in the case of nebula (h alpha).
The color saturation of the nebula is significantly better. (from orange to red)