And this?
Sorry, @Peter, I don’t want to hijack your thread, just add more (related?) info and maybe help find a solution.
EDIT: Now addressing your question, I followed @sguyader’s method on dpreview
Before:
After:
I pulled down the H Cutoff slider to 0.2 and raised Space and Value till the point where the bright areas aren’t affected. If you increase them too much, you begin getting distortions on the bright areas:
(see the bright strip at top left?)
Maybe we could use it this aggressive way and then mask the bright areas in Gimp.