The bolt holes are stripped .. already tried to rethread them with no luck
A body saw (mini sawzall) can be used in tight quarters, and has a reasonably short narrow blade. You should be able to cut the wheel down to the shaft with it, or at least close enough to split it with a chisel in the slot made by the saw. A Dremel tool with a small carbide end mill might also work, to cut down to the shaft. Just remember that it is smaller toward the threads, so you do not cut the shaft.
If you can re-rethread the holes one more time, and use some "Freeze-off" on the hub, you might have a chance of getting it off. You need to put something under the column to catch the excess fluids, so they do not ruin your carpet. My brother used it on a "frozen" O2 sensor, and it almost became finger tight. Another option is "dry ice" applied to the center of the wheel, and shaft. You may have to attach it there until it makes the parts cold. If you have liquid nitrogen available, that would work quickly, if applied to the shaft. After using these cold products, do not touch the parts for a couple of minutes without insulated gloves. The last couple methods may be a little extreme, but are viable techniques. You might even want to remove the steering column from the car to work on it. Removal only takes about 20-30 minutes. Removing the column allows you to access the back of the wheel as well as the front, and you might be able to put the wheel between two strong braces (work benches), put the nut on the shaft, and hit it with a proverbial BFH. It does not matter if you damage the wheel.
Your worst case scenario is that you must replace the column. Replacing the column is probably less work than what you have done up to this point. 91 columns are unique to the 91s, 92 and 93 columns are the same for both years, and the 94-96 columns are all the same (low option cars without cruise control are different) and can be used on the 92 and 93 cars as well. If you can not find the correct color, you can get custom mixed matching paint from the SEM Color Coat line (some stock colors are good matches for certain colors).
1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check http://www.impalassforum.com/vBullet...ion-parts.html