I was able to get the crank bolt out after fabbing a tool to hold the crank pulley in place. I found some thick angle iron, drilled 2 holes to match the crank pulley, and used a grinder to cut out a hole for the 30mm crank bolt socket. The hole for the socket is big, and I was hoping the tool wouldn't break before overcoming the 300 ft-lbs.
It bent but held together, and I got the bolt out. That's a huge bolt!
Picture of the tool and crank bolt:
It bent but held together, and I got the bolt out. That's a huge bolt!
Picture of the tool and crank bolt: