Still have a old pair of Lyotard 460D, wide double sided pedals.
the pre spud cyclo-cross racers cut the toe strap, and screwed the portions
on the outside ends of the pedal..
so there was an open space for the mud on the shoes to go,
Stiff straps, and a doubled layer toeclip, so the opening
for your foot stays open..

watch older cross race videos, the knack of jumping the barriers
remounting and flipping both pedals simultaneously,
within the second crank rotation, and so, losing as little momentum as possible
.. impressive ..