1988 Ford Ranger broken Bolt on AC compressor

I am teying to change the water pump in a ford ranger 1988 2.9L. To release the tension on the 3 belts you undo a couple bolts from the AC compressor, alternator and power steering pump to allow them to shift some. Well one of the bolts on the ac compressor is missing the head. Its rusted and stripped and just all screwed up. I think I HAVE to remove this bolt to move the AC. How do I get the bolt out! I have tried using wd40. I have tried using vice grips. Tried hitting it with a hammer. I have the bolt extractor set BUT my drill is to big to access the bolt properly with the drill bit on it. I dont have a torch so the hot/cold and/or welding ideas are a no go. And its impossible to find a proper diagram of which bolts I am even supposed to loosen so if anyone has a picture and can upload it here that'd be great. As MAYBE I dont have to take this one off? I am lost. And over it. This has been going on for days. Help please. Thanks!