Deoldify Vapoursynth filter

[domb84]

I've got an issue with a cheap super 8mm film scanner that on certain scenes sets the auto white balance so that there is a horrific blue cast across the entire frame. It's scene dependent and no way to disable it in the firmware (unless its de compiled and reverse engineered). It's so bad on some scenes that I can't correct it. The best I've found at correcting it is deoldify, except of course it treats it as though there is no colour information at all, so what is there is lost. I've tried to merge the original and deoldified frames with limited success. 

I cannot find a function within deoldify to attempt to restore badly calibrated frames as opposed to colouring b&w. does anybody know of a way I can achieve this?

This is what i have currently with an example of the worst scenes.

https://mega.nz/file/4KIjibYa#wISHeTNwA4...xW_taUju0A

The above is not too bad considering, but when compared with another scene from the same scan, we lose a lot of what was good. of course this frame doesn't actually need anything done at all, but that's where I would like to get back to.

https://mega.nz/file/9ShRHRDJ#EmWvPeF5X-...83xbXo-OVg

I'm sure is there a much better method to remove the blue cast, but I'm unable to land on a method of white balancing across the entire film scan that resolves the worst parts, and 90% of the scan only needs a simple adjustment.

Any help appreciated!