I don't know if this helps.... Partially because I don't know if your Jeep is unibody or body on frame.
I broke off a bolt removing the sway bar bushing bracket on my XJ when I was putting in the new steering box.
I tried to drill it and EZ out the broken bolt, but no luck. I put my EZ out back into the hole and tapped (Yes, tapped!) it with my hammer to set it in place better for another try, and sonovagun, the weld holding the nut broke, and the nut and broken bolt popped free, up into the unibody frame rail.
I had some nutserts, so I tried one in the hole, but it wouldn't grab the sides of the hole properly, so I taped a nut into the box end of a wrench, slid it up the frame rail (after pulling the bumper) and just popped a bolt through.
It was such a simple fix, I wish I'd never spent the time drilling, messing with the EZ out, and the nutsert. Pulling the bumper takes a little time, though.
Geoff