Broken Captive Nut

In the process of replacing the bushings on my civic, I managed to cross thread one of the lower control arm pivot bolts. Having already sent myself down a creek without a paddle the captive nut inside the subframe broke off while trying to remove it. The access holes in the subframe aren't in a good position or large enough to get at the bolt. I really don't want to tear the front end of the car apart again as I'm doing this in a driveway with the car a foot off the ground. My two thoughts are to have a shop either weld the bracket that the pivot is in to the subframe or to cut the subframe open to get access, make the repair the right way and then weld the section back in. The car in question is a beater in every sense of the word and realistically only has a few years (fingers crossed) of useful life left in it at best. What would you do?

I thought this thread was going to be about a crazy prisoner who finally spilled the beans.

Good luck with the repair; I hate LCAs. I vote for rare earth magnet moving the bolt where you want it, then a modestly sized drill hole to pull it out.

Option 1: See if you can drive an icepick in to keep it from spinning and then use an impact gun.

Option 2: Buy a welder. If you were going to pay a shop anyway, you're getting it for half price already.

Miatas have this issue with the rear shock bolt in the lower A-Arm I would open up with a cutt-off wheel, peel back enough to get a wrench in there, and do the \MIG weld magic to get back where you started.

While in there, weld that nut to something solid!