Jerry, your opinion matters!
At the end, I'm happy to have achieved better results this time, but I do agree there are still something not possible to reach with this script... if it will be perfect, now I was rich and famous! (^^,)
Well, I think I'll go for the open matte version first, then I'll see IF, eventually, do a proper AR version... at least, I guess the cmnew will be useful for other, future regrading projects.