You could try this, but the odds are stacked heavly against you :( Copy the track, a couple of times if necessary. On one of the coppied tracks filter out everything except the guitar, ( as best as possible of course ) now do some radical EQing to try to get some body out of it. Now make an EQ cut in the main track where the ac guitar is the nastiest sounding, not to radical, just enough to tame it so its not as tinny. Now blend the copied thickened up track with the original to taste. You could copy the thickened track again as well and time shift it a little to try and get that double tracked type sound or use one of the doubler plugins. Like i said this might not work but its probably worth a go. Cheers