Put the straw on that PB Blaster and get some dribble-down from the upper bolt hole, above the stubborn bolt. Once you PB Blasted the bolt good, get the other three bolts back in tight, and tap on the stubborn bolt lightly, to cause some vibration, so's the Blaster can get in there.

I'll be bringing you the gear assembly from my 2.0 and I'll bring the bolts for the pulley, so you don't have to use the old bolt.

There is no question about the timing issue...what's the right-side of the timing belt feeling like? I don't doubt that with the broken belt and all that grease, it's slipped time a tooth or two, and the tensioned-side is slack. Though the existing belt may be in good shape, please DON'T attempt to re-use it. Once you get it off, i bet you find some serious damages to it.

And be sure to get a new roll of toilet paper: as you see, Forest Gump was correct: shit happens.