I tried several things on this. I did get the "Cleated belt" I was looking for by mating a bunch of cleats to the same path. However after adding 50 cleats each with 2 path mates the assembly became unusable. My final "Work around", not elegant at all but work for my motion study, was a 100 foot long flat belt with an array of cleats that was driven by linear motor.
Didn't go around and around and look cool like I would have like but allowed me to study the hopper shape and interaction with the belt which is what I needed.