One of my friends figured this out. I’m sure you can emulate the workflow he uses in his free FCP plugins.
“when an image is blown out, especially on the skin, not all color channels are necessarily over exposed. Often when the red channel is blown out, the green channel may still contain good information. This plugin lets you selectively substitute one channel for another in the over exposed areas and color correct it to match.”
Captain’s Blowout Fixer
https://pistolerapost.com/pluginz/
You could try dup the layer, subst good green for bad red with channel effects then layer over with screen, lighten, or add.