Rear Suspension: Stripped Pull Link Nut at Body - Tool Suggestions?

[bruce.g.cameron]

I've tried all the tricks I had in the book to prevent stripping the bolt head and nut on the driver's side rear pull link (forward upper), but I did it anyway! I heated it with propane beforehand (as much as I dared with the fuel lines right behind it).

So now it is stripped. I tried a set of needlenosed visegrips on the nut and a regular visegrip on the head, but couldn't get enough grip on the nut. Regular visegrips just barely fit the nut, but don't have space for rotation.

Short of dropping the whole subframe, any other angles on this job. The other links on the driver's side have been ok so far.