I’m recreating my LUTs from the other topic about building LUTs with your program as we speak, and will report my findings. I modified your scripts to use my already-generated training set instead of processing each file with your provided darktable style (cool idea, though!).
My plan is to create LUTs that go after filmic, where we’re in display-referred space, and retain filmic’s processing options. We’ll see how well that goes! I’m excited, as my own approach didn’t fare well with high-saturation colors. I’m hoping yours will be more robust in those regimes.