a) You need a faster lens, at least f/2.8 or shoot more pictures for stacking
b) Set the camera to ISO 640 (with higher values you have less dynamic range and less colors)
c) Set the camera to daylight white balance
What @Thomas_Do got out is probably the best you can get. For demosaicing VNG4 + one time color smoothing will already reduce the noise a log. So one denoise profiled should be enough to get rid of the rest.