I’m not sure is my honest answer I’m sowing wheat for flour for local cafe as an experiment and from my reading up it seems it needs to be dryed and cleaned but if fans will do I have that setup from years ago when we grew barleyIf you are storing the grain on your farm for on farm use could you not just blow it rather than dry it. Ambient air is a much simpler option with things like pedestal fans. We aerate 25T silos with a coil of drainage pipe in the bottom and a 3kw fan that we move from silo to silo.
Cheap grain cleaners are becoming a bit like hens teeth. if you only want to take out chaff and straw would a cyclone do a good enough job?