Andy, the first question is have you tried the brake adjustment to loosen the shoes. Getting the shoes to brake loose from the drum can sometimes be done by hitting the drum with a hammer to "jar" it loose. Sometimes putting pressure on a couple pry bars while someone else hits it with a hammer will break it loose.
Can you hook a chain to it and pull it. Did this once with a 40 Chevy. It slid then broke loose.
I'm sure someone will give you and easier answer???!
