You could mix the goats, sheep and a donkey like my neighbors. They never mow their pasture and it looks like a golf course cut.
You have to watch the goats and donkey.
The kids are cute to watch and don't venture far when they walk out. Next year the may be to big to get out between the drive gates.
Getting way off track but if you want to install an automatic gate or gates a cattle would be a good investment.
Back to the ditch mower. With the right design it could be operated with blocks, cable and winches. Cable and blocks would be a only added weight to the boom. Winches would only add weight to the tractor.
Here are some of the projects I saw browsing the web that I found interesting. For my tractor I think the last design could work. Soon it looks like your project will be on my list too
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When I started with the plasma I only had 120v as an option, now with 220v it says it'll cut 1/2" steel. I've been looking at small milling machines as there is some stuff I could probably do on one and my desktop drill press just doesn't have the power to do large holes in heavy steel.