these NOS! shoes from the 70s are exactly what I've been looking for:
stiff soles but cleatless.
maybe VeloOrange could remake them?
and a shot of the sole, with molded ridges to catch onto your pedal
actually, these soles get a little slippery in the wet (which we've had a lot of lately)
and my feet would have slipped sideways off the pedals if I wasn't using toe-straps.