Shifting the chroma would shift the chroma of the whole image, which is wrong for your case since the chroma problem is just localized.
One could write a script which only shifts the chroma on the edge, but then you have something similar to balance borders and similar.
You can also adjust the BalanceBorder settings (maybe also try cRight=18) and or apply it multiple times, or additionally use other filters.
=> simply play around a bit with it, but global chroma shifting is the wrong approach.
Cu Selur
One could write a script which only shifts the chroma on the edge, but then you have something similar to balance borders and similar.

You can also adjust the BalanceBorder settings (maybe also try cRight=18) and or apply it multiple times, or additionally use other filters.
=> simply play around a bit with it, but global chroma shifting is the wrong approach.
Cu Selur
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.

