I recently tried using a special ball joint tool that looks like a gigantic c-clamp with special cups for different size joints. I thought the tool itself was going to break when I put an impact gun on it. This is definitely not a part you could fix on the trail.
I opted to replace the factory lower arm instead because my bushings were toast as well.
What'd be your preferred prep for a failure on the trail?
Carrying spare control arms would be heavy and take up a bit of room. Is there any easy way to limp yourself off a trail with a broken ball joint?