I don’t know if this would work for you but in past years I have employed my chickens to clean up after I am finished harvesting whatever I was growing. I used puppy playpen panels to confine them to the work area and after a couple of days moved them to a different area.They discovered seaweed this morning. It was like all their christmases had come at once!
I'm going to play about with a few different mini chicken tractor designs, to see what works for putting a few of the more amenable birds on someone's plot for a few hours when they're clearing out a bed.
In the spirit of full transparency I did have a strike (possibly from asking them to work on a Sunday) and haven’t tried again since.
The strike took the form of ignoring the call to work.

