Years ago I saw a Utoob vid (can't find it now) of a guy who mounted a 2x8 maybe 6ft long with a center pivot on the front of a lawn tractor.
He had ropes tied to each end so he could swing it side to side like old go cart rope steering.
I think he pulled one rope and then stepped on both to "lock" the swing.
Seemed like it worked for the 4" he was clearing.