Subjective indeed. You must do what you think is right. Though if your work has made the blu-ray look like the IB prints, it will probably be popular here. Can you produce an LUT or is it too shot specific?

As for basing it on props and set photos, I'm sure that will give you a nice realistic color that looks much better than the Blu. But doing this alone will of course ignore any original color grading. For instance, the R2 Jawa scene would end up being in daylight as some LD releases looked.