I would be curious about that, but I’m wondering if it’s not already covered in DFAO? DFAO supports specular occlusion, and there’s no easy way I can think of to feed color information to SDFs without the surface cache (lightmap probe interpolation?), as otherwise you’ll be paying much of the cost of lumen already.
I can personally think of a fair number of scenes where proper occluder parallax would have made a much bigger visual difference than color-correct reflections. I think it would be a good feature.