Analog approach but the whirlwind mix 6 is panable on the 4 mic inputs and 1u
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The current model Mix 6 does not have the pan controls only left right selector switches, the older Mix 6 model did have a true pan control. the Whirlwind strip mixers are solid and dependable.
Here's another option, look at the Presonus Studio Live 16R rack mixer. Single space, lots of processing. You would need to rethink your control interface, it has no direct RS232 control input. You would have to go in via MIDI through the USB port.