Thanks! This is helpful. I’ll see if I can take a separate picture soon and upload it – that one had a face in the bottom that I cropped off since the subject might not like me uploading it here 
I put another image here 20231230-darktable-sample – Google Drive
which has the same purple cast, but not as exaggerated. This image was taken in mid-day, not at sunset.
Screen is a Dell U2723QE which is 100% sRGB.
I think the main issue I’m having is if I calibrate correctly for the clouds and sky, the grass becomes pale, faces are unnatural color, grey objects like clothing become purple.
If I color calibrate for the grass, the sky looks out of whack.
If I color calibrate for midtones and highlights, the black objects become purple and not neutral grey.
I wish I could set a different white balance for shadows and highlights and have it interpolate between the two.
This is a Sony a7r4 that is astro-modified and then has a Kase hot mirror filter clipped in for daytime photography. Lens is a Voigtlander 21/1.4. There is a Cokin Nuances Extreme GND8 glass filter. I get almost no color casts when shooting indoors, this seems to be almost exclusively an outdoor issue.
I’m wondering whether UV light could be getting through this setup, though I thought the Kase filter would cut the UV. This image was at 3000m above sea level if it makes a difference.