There's a fairly easy way to remove it if your freewheel remover has a hexagonal head.
Assemble the remover into the hub and tighten the QR with the nut on the removers side. Bring it and a cup of coffee (or other inducement) to your auto mechanic and ask him to remove it with his air impact wrench.
I've done this while holding the shell in my hand (wear gloves, because it may slip and those spokes can be deadly) and had the freewheels spin off. If it resists, wrap 1/2 turn of an old leather belt around the right flange and secure it in a vise (not tight enough to damage the flange) and the impact wrench will pop it off no problem.
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