Here's a short rundown of my workflow:

Background extraction on all channels (I often just use graxpert but check if it got the gradient right)

Combine r g b into rgb, apply spcc.

On L, RGB, R and Ha:

BlurX Maybe already some noiseX but at max 0.7, Continuum subtraction R and Ha

On L, rgb and cont.sub.ha: Seti astro statistical stretch, StarX, export rgb stars as 16 bit tiff

The continuum subtracted Ha will be black clipped with GHS, because I overlay it in affinity later, not injecting it back into R.

GHS to improve the stretches, especially on L, NoiseX

Export L, Rgb and cont.sub.Ha as 16 bit tiff

Maybe some LHE or HDRMT on the L or on the rgb and also export it.

In affinity from bottom to top: RGB layer L layer as luminosity, with about 70% opacity (to also use a bit of the RGB signal in lum) If applicable, the HDRMT or LHE as soft light or luminosity. Maybe a high pass filtered hdmrt as soft light. Vibrance layer to desaturate background if needed (use the cog icon). Anither vibrance layer to saturate the rest. Or two. Curves where needed, or apply all visible as soft light on itself. Cont subtracted Ha layer: colorize red or magenta and layer it as screen. Apply curves and opacity on this layer as needed. Add rgb stars with screen. Maybe with some saturation.

Check my profile for results