If you could use a bag seeder, Mills Fleet Farm has the Earthway 2750 on clearance for only $18. This bag seeder seems to be pretty popular with food plotters, so I thought I'd share. I just ordered one to overseed some of my plots with rye in a couple weeks.
https://www.fleetfarm.com/detail/earthway-nylon-bag-seeder-spreader/0000000257880
https://www.fleetfarm.com/detail/earthway-nylon-bag-seeder-spreader/0000000257880