Dan, sorry to hear you are having issues.

I did my Civic myself and am considering doing our V6 Odyssey.
You mentioned that you used an electric impact wrench. Do you have any idea what its torque rating is? I am guessing it is lower than you need. My suggestion would be to use an air powered impact wrench. If you don't have a compressor, you may be able to borrow a wrench and use a small portable air tank. I was able to break mine loose with an air wrench, but I dont think I would have been able to do it with a breaker bar without a way to lock the crank.
I think there IS a tool to lock the pulley. You might check some local parts stores to see if they have a loaner?
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Richard Casto
1972 Porsche 914
2013 Honda Fit Sport
2015 Honda Fit EX
http://motorsport.zyyz.comMoney can't buy happiness, but somehow it's more comfortable to cry in a Porsche than a Kia.