I thought this was kind of an interesting thread so I decided to give a spin implementing this on the material level just to see what happened…
Top Left: Path-tracer
Top Right: Blue-Shifted Lumen
Bottom Left: Original Lumen
Bottom Right: Blue-Shifted Lumen with Short Range AO disabled since it seemed to over occlude in this scene compared to the path-tracer.
This is simply using an RT switch to multiply the base color of the material by ( 0.975, 0.975, 1.05) during the raytracing pass only, causing reflected light to be slightly bluer than it otherwise would be. In this example the base color was (0.7).
Definitely seems to bring things closer. But the downside is it also impacts raytraced reflections. This makes the transition between screen tracing and ray tracing more noticeable.