We went back and forth a few times trying to get everything just right - but in the end, I think the picture speaks for itself. Sneakers and Soul is playing in festivals now.
This is an example of one of the node graphs I had to use to "fix" the blue channel and bring the luminance back to the image. It splits each of the channels out into its own branch where each channel is adjusted as needed, and then they are recombined with most of the information for the blue channel coming being borrowed from the green in a 3:2:1 mix of Green Red & Blue. These are then blended as needed, then split out into chroma and luma channels where the luma is advanced separately from the chroma and the chroma is processed through a denoise and sharpening combo. Voila - a vastly improved image.

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