Have always put toilet paper in the head and never had a clog from it. Of course I do ask guests to use some restraint in the amount. If a large wad is needed some reason (I don't ask why) either put that in the trash or separate into smaller amounts to flush in several stages.
Basically tell all guests that you do not put anything in the toilet that you did not eat first. ONLY exception is toilet paper in reasonable quantities. Do not want to make the instructions too complicated or the whole process will break down.