Photoshop: Blend If & the Zone System

In the BlendIf window, I'd like to see a strip below the blending bars that shows the zone system. This would be purely used as a guide  to better judge where certain tones lie on the grey scale and how they relate to the pull out triangles. At present it's mainly guesswork as to where certain grey tones lie. I think this would be helpful for users of the BlendIf options.