Do you have this shot from the LD?:

2D BD

3D BD

Film cell

Here the 3D BD is definitely more faithful to the theatrical colours whereas the 2D (and also the DVD releases) have a deep blue tint added. If the LD has the blue tint as well then I would say the 3D BD is the best colour source we have and any restoration should be based on those colours. I have other film cell images that definitely show the deep brown look was present theatrically. For example:

and another:

As for TR, based on your video, I think a restoration would definitely be worthwhile. :)