Cargo Bikes

There are other brands out there offering single sided SPD/flats but always worry about the quality/consistency of the clip-in side. These things are always about compromise! :)

The Wellgo WAM D10 look to me to be the best as they have screw in pins which I imagine will add a lot of grip but it's hard to tell the size, probably still quite small compared to a pucker platform pedal I imagine.