I think I would go with a quality solar powered rig with battery. You won't need a 30 mile fence capability so a 10 mile would be plenty. As you probably know, temporary non-conductive posts are available designed to attach multiple runs of wire. That way you can run the smooth wire in a long loop that starts close to the ground and ends with a run at 4 ft. or so. It should be quick and easy to set up. If an animal of size gets tangled in the wire, you may be doing a little tracking. LOL Sounds like a good idea.
I used to run a single hot wire around my pastures. I've seen it dissuade 1700 pound bulls from crossing. I no longer have cattle (but I do have a hat ) As of late, I used a small charger to keep a cardinal from scratching up the mirrors on my F250. I figured it would kill him but it didn't. He's still around but, he no longer fights his image in my mirrors.