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And DW makes a really nice one, where the beater mechanism lives inside the Cajon.There are Cajon remote pedals ...
I envision the slave pedal going down, which rotates a round pulley on the right side of the slave pedal. The cable is solidly attached to the bottom of that pulley, so when the pulley is rotated clockwise (and cable pulled), the other end of the cable would pull on and rotate a pulley on the main pedal counter-clockwise that's attached to just the slave beater. Half a turn rotation of the pulley tops. So there's no pushing, only pulling of the cable. Springs attached to the pulleys return the pulleys (and cable, slave footboard and slave beater) to their cocked position when the footboard is released, just like they do now. I think it's an easy to design system that would be an improvement on the existing double pedal design.