>>2628121You could probably recover from the noise and underexposure with the original image.
What I did to clear it up a bit was (after importing in 16-bit for less banding from all the stacked filters and adjustments and future HDR Toning) some minor denoising, and then in a duplicate layer some heavy denoising. In that duplicate layer I went into blending options and had it fade in when the heavily denoised layer was dark.
Then I split it into HSB, brought the brightness channel (would be the blue channel) over to a new document, and ran it through HDR Toning (which doesn't seem to react properly in 8-bit) with the default settings except for lowering the highlights so it doesn't clip.
Then I brought that back over to the original image, replacing the old brightness (blue) channel, and then I took the saturation (green) channel and put into a new layer so that I could use shadows / highlights on it to smooth out the saturation levels without the effect also reading the values from the other deselected channels. Then I brightened that up a bit with curves and put it back into the image and converted back to RGB from HSB.
This process has worked very well for me.
