With some washers or adpaters or at least some grinding or rasping ist will probably work at any unicycle. Just make sure, that it has a planar contact surface to the frames bearing housing so that the brake force is lead into the frame and not into the bearing. With bearing housings that are not machined (sheetmetal) you’ll need an adapter to provide this planar face for force transmission. I just made one for my Muni, look here at the german forum for my project with d’Brake and adapter. But also some modified washers will make fine like shown here.