VCA Inversion button per channel/track being controlled - ie, one channel goes up, and one channel goes down

Let’s say I have 4 tracks, and they have a VCA assigned to them. I want to flip VCA polarity on one of the channels so when I boost the other 3, the one goes down and then when I pull the VCA down, the one goes up and the other three go down.

This would be an interesting way to create easily controllable creative crossfades and crescendo/decrescendo sweep exchanges between different sounds.