Callair, Fleet Fort, Ryan PT-22, Spezio Tuholer, Stitts Playmate, Volksplane and many crop dusters.While rare, strut-braced low-wings do exist. The strut would probably have to be a little heavier to resist buckling but the rest of the structure in that airframe has to be pretty close to what you’d need to move the wing down.
We seem to have talked oursleves in a circle.
The primary addition to a 21st century Volksplane is a stiffer cockpit structure to reduced wing twisting. I often thought that V-struts would serve that purpose by triangulating wing loads to the instrument panel bulkhead.
A secondary advantage is easier broading over the trailing edge.
A third advantage is easier wing fold, more like Stitts Playmate. Routing control cables along the rear spar simplifies un-folding.