Simplifying many window comparators
I think Brian's non-SW answer is the best but here's a purely analogue solution. Use a circuit that inherently chooses the highest voltage input (from several) and puts that to the output. Ditto the circuit for the lowest voltage.

Consider the precision rectifier: -



It produces an output voltage that follows the input voltage throughout its positive range. Now consider what happens when you have two inputs like this: -



Whichever of V1 and V2 is highest will win the battle to drive the output line. Step and repeat for 8 inputs then do the same with reverse connected diodes and you have a solution that generates two output voltages that represent the highest and the lowest levels from several different voltage sources.

I'm not 100% but I think you can reuse the op-amps for the lowest voltages. Maybe I'm wrong on this?

Then use comparators on both lines to determine if one from the eight might be out of range.