Andrea, I would find the best setting for the whole film, apply it, fall back on ColourLikeFBF() or RGBMatch (even though I know you don't like it much) for those scenes with noticeable artifacts, and just accept that they do not achieve results that are quite as good as one would like. Some of the differences between your settings are so subtle that it is doubtful that anyone would notice in motion, so a few scenes in which the color correction is not quite perfect would not detract significantly from the overall experience.

Anything else would take up too much time. The results would never be absolutely perfect, even if you did take years.