Yup, you can correct most of the reel in one go, provided the color shifts are consistent. This is what I’ve done with the above examples. I did notice that the early Tantive IV shots of reel one have slightly different shifts, so they require separate correcting. The procedure is as follows:

Calibrate the color correction model on a set of frames, preferably with neutral colors, so not too many delibirate color biases. I wouldn’t calibrate the model on the Tatooine frames, as these had filters applied to them. In this case I calibrated the model on 1 out of 24 frames of almost the entire Tantive IV sequence.
This model is then used to correct almost the entire first reel.

It’s as simple as that. The second reel I think is more challenging, because it mostly features Tatooine footage, but we’ll cross that bridge when we get there 😉.