So, here’s the idea.

An analog delay pedal with four to eight channels of fully parametric delay (delay time, delay level, feedback) that can be ping-ponged in any combination. Make half of the channels dual input with a blend.

It would even be OK of it used patch-cords for patching (as opposed to switches, or logic)

I thought about this when pondering the possibilities with a SMMwH, since you can always feed the left back in through the right and take a mono out from the right to the amp.