This is what the original looked like after stacking 28 light frames (4 min subs) with 40 dark and 50 flat frames in Siril. You can barely make out the red portion of the nebula.
I processed it in Photoshop, adjusting levels, curves, raw camera filter until I liked what I saw.
I then exported a tif and used StarNet++ to remove the stars so I could further process the nebula without affecting the the color of the stars. I use the stand-along version of StarNet++ and followed these instructions I found on CloudyNights to install it on my MacBook. Below is the starless version after removing all the stars.
I then opened up the starless version in Photoshop and layered it on top of the processed layer. I adjusted the starless layer opacity until I liked how it looked. The results are below with the combined starless (layered) and processed final version.
Final signature image
