[HELP] 80s movie with video inserts

[Selur]

About the combing: simple deinterlacing works fine.
About the clock skew issue which caused the upper half flickering: I'm pretty sure I have suggested something for this clip before.
About the chroma:
Is that really chroma noise?
Adding more blue to the color, it looks to yellow (side note: I am !really! bad when it comes to color grading)

clip = color.RGBAdjust(rgb=clip, b=1.200, rg=0.850)

and shifting the luma ranges:

# adjusting color space from YUV422P10 to RGB30 for vsLevels
clip = core.resize.Bicubic(clip=clip, format=vs.RGB30, matrix_in_s="470bg", range_s="limited")
# adjusting color using Levels on RGB30 (10 bit)
clip = core.std.Levels(clip=clip, min_in=0, max_in=872, min_out=64, max_out=940)

It doesn't look so bad.

(AutoWhite or GrayWorld will do similar)

You could also try some DeRainbow and denoising and only use the chroma adjustment of the denoising (using Merge Y=0,U=1,Y=1)
HQDN3D also is usually works fine with chroma noise (simply set spatial and temporal luma to 0)
If you have an NVIDA card and the torch addon is installed using BasicVSR++ limited to chroma (using Merge Y=0,U=1,Y=1) can sharpen chroma.

(just to sharpen the chroma aWarpSharp2 applied to and limited to chroma also can help)

Hope this helps to get you started.

Cu Selur