Yes, we would need an arm that would hold the angle required, and also be able to swivel up and down to allow for uneven ground. Easily done. You couldn't keep Fred from mowing if something like this was rigged up.
But this would only be good close to the tracks. Getting 2 passes in. The farther the stretch on the arm, the weaker it becomes. I believe we could make a working arm long enough to handle 2 passes fairly rugged.
This will still fall short of the 33', but if we had some self propelled ones to get stuck, I mean to do where this won't reach, it would go much faster next year.
And just an observation. If those who are against a mechanized bushwhacker would pick up a weedwhacker and help, we would be that much further ahead. And we may not need to mechanize. But our trusty weedwhackers are both over 70, and the rest of us that try to help are not getting any younger. But our line continues to grow. Both in height and length. We need to dream, and eventually we will come up with something that works for what we need.