While the 35mm trailer shots may or may not be an excellent source, do you not think it might make more sense to grade to a known source such as LD or DVD rather than trying to guess the look of a theatrical print?
In my view, as soon as one starts going with what 'feels' right or trying to strike a balance between sources, it's starting on the slippery slope towards just another revisionist version rather than an attempt at a preservation.
Any thoughts on this?