Best way to prune a field is to invite a herd of big ole' cows over to graze. After the cows have gnawed away all the weeds , the cow "patties" produced (cows have a very active digestive system) could be relocated to each teams' restricted area. You may wish to offer the suggestions....
Wingmen : work just a little inbounds.
Chain crew : don't wear sandals or Birkenstocks, LL Bean muddies suggested.
Coaches : Don't even THINK of entering the field if you have been roaming the restricted area!