Odd Request for Groups

Not sure if this will make any sense.

I've found that with media layers, it helps to use groups for each of the layers and color the groups with whatever custom color I choose. Then, any layer(Group) that is not being used, I change the custom color intensity to a darker version of the color. This gives the groups of fixtures that are being used the appearance of being highlighted which helps me see which layers I am using.
My request is to automate this by linking the Color Intensity of the custom color to the fixture's Intensity. If the fixture is outputting above 0%, then the color of the group displays at it's normal value, but if the fixture's intensity is programmed at 0%, the custom group color changes to a darker value.

Thoughts?