Frozen lower left alternator bolt

I think you're going to have to accept the fact that you will be opening up a can of worms with your frozen bolt problem.
The bolt is rusted stuck in the block, and more than likely you will have to remove the water pump, timing cover, and then drill out the remains of the threads that's left in the block.
Either accept the fact that the bolt will break, or just grind the head of that bolt off, or keep twisting till the bolt snaps in half, and remove all the others off the water pump, and timing cover.
And who's to say you might have other rusted stuck, frozen, bolts too.
You got a dilemma, on your hands.