Just finished the first conversion using ColourMatch: after a brief look, it seems almost all scenes are artifacts free; the few I found could be easily fixed using another version - that, unluckily, works only for few hundred frames.
Some others, that are not a bit too different from DVD, could be fixed using another color matching script; further testing are needed, though.
Now I go to sleep; I will stay away from my main PC for two days, so no project updates until monday.