So, at the end, it is possible to apply the LUT to the GOUT using Avisynth? And, if so, how?
I thought also that the regraded GOUT could be used as color reference to regrade BD - a bit convoluted, I must admit, but it should work (in theory)!
I don’t know if it is possible to apply a LUT in Avisynth, but you certainly could use the regraded GOUT as a color reference. However, a regrade of the SSE would be higher on my list…