Any way to batch gradual exposure change?

I make time lapses and there is a very common frustration where flicker is created by small exposure changes due to the aperture blades not falling in the same position or when using an auto mode where exposure changes and the camera changes exposure values.  To problem is worsened when doing a time lapse during sunset/sunrise when one expects the exposure to change drastically but needs to compensate in order to get the entire scene.
I've experimented with using Lightroom's "Match Total Exposures" feature which is great at adjusting the exposure to even out the discrepancies between changing exposure values.  But this doesn't take into account the exposure of the scene is expected to change.  So when doing this for a sunset, as I increase the shutter speed to account for the setting sun, Match Total Exposures adds negative EV because it recognizes the longer shutter speed would be over exposing the selected "correct" photograph.
I would very much like to find a way to use the Match Total Exposures feature to first even out the exposure changes from the changing parameters, and then apply a batch gradual exposure change to the series so that it will know to allow for these changing lighting conditions.
Lightroom is great for adjusting individual photos or for a series under the same lighting conditions using (sync settings and match total exposures) but with changing lighting conditions is would be great to have the ability to gradually adjust values, not just exposure but other tone values.

You can probably fairly easily modify the script here.

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