Does anybody make...

Good luck with that one.

I think the Pass Labs XP-32 can do what you want. 
 

In its normal config each channel has two outputs. One has the ability to be adjusted via a smaller gain knob on the front of the chassis. 
 

You can order additional units to stack and control from the one main volume unit. 
 

Would be $$$$$ though.

Higher end surround sound processors with matrix routing would work.

Would an active x-over work?

Check out Marchand Electronics. If they don't already have what you want they can probably build it........

https://www.marchandelec.com/