Define surface color in Design Table

Hello

I'm working on a part with quite a lot of variations. It's basically a union for tubing. There are 6 possible tubing sizes possible on both sides, so 30 different combinations.

To easily identify the parts, I want to color-code the ends of the union. Every tubing size has its own color (this color is used on the tubing as well).

How should I go about this? I'm not limited to this union only, there are more parts to do. So making Display states for all of the individually is a no-go.

Colors should also only be visible while designing, not when rendering.

I tried adding \$color@feature_name, but it changes the color of the complete part. Is there a way to identify surfaces as well?

Thanks!

Tom

SolidworksParts And Features