As I wrote before in this thread, I did some regrading tests using the latest version of my ColourMatch script and even if it works very well in a lot of shots, sometimes it fails, due to the fact that 4K BD grading is so different from Mondo BD that for the "poor" script (^^,) is impossible to make a perfect work...
So, apart the hand made correction shot-by-shot, that will take so much time I'm not ready to spend in any project, another viable way could be to use the ColourMatch script, and eventually correct the not perfect shots by hand... and even in that case, it will take a very long time...
IMHO, the best thing to do right now is to get kk650 version - the best version actually available, and probably for a long time - then wait for the eventual BD re-release, to see how good/bad it will be...