Repeat 50 times and you've cleared 4 acres!
But that's a really cool and imaginative way to remove FA! You may be able to join a couple of fiberglass pruning saw poles and hook them to an ATV or tractor PTO. I bet a good rough rope would also spin and entangle the FA. Maybe mount the rope on a swivel on 1 bank, and somehow spin the rope on the other end. Thanks for the nice film Gene!