Broken Bolt in Water Pump

So, I was changing the water pump on the 340 and snapped the the lower bolt on the somewhat triangular bracket that supports the alternator. I soaked the bolts the entire week and even tried heating it up a little but to no avail ... el snapo! Of course, all the other bolts came off easily and I can actually pivot the entire pump clockwise a little. It appears that the bolt is pivoting as well.

So the question is ... If I can't get the pump to slide off the broken bolt (which would be nice so I could try and get some v-grips on it), is there any other methods that you all can think of besides an EZ-out?

I'll post a couple of pics of the offending bolt (or what's left of it) below. Thanks in advance.

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