So I cut the access hole, a circle 3" diameter. I used a drill to do some small holes around the perimeter and then cut it between with a jig saw. I got the hole in just the right location. The hole doesn't allow you to get on the nut parallel but with a swivel joint you can access with a breaker bar. To get on parallel to the bolt you'd have to cut through multiple layers of bodywork which I am not interested in doing.
That's all irrelevant anyways since I couldn't do it. There isn't much rust on this truck but that nut was rusted on good. I ended up hitting it with the propane torch. I removed all the wiring mount clips which was a pain (I dont recommend ever doing this), filled with sand to cover the rubber bushing, and put a large washer around the nut to protect below from heat. And I had a fire extinguisher and hose ready to go.
With someone holding the shock below I managed to remove one nut but I bent the top bolt. The other bolt just sheared off. I do not recommend trying to salvage old shocks, just get new ones. But I do recommend cutting this access hole which will allow for easy installation of the new shock and yearly inspection, cleaning and application of rust inhibitor.
I cant seem to attach photos from my phone so I'll add later.