Is this plug steel or aluminum?
If you have a friend with a little 110V welder with some flux core wire, ask if they can come over and lend a hand. Use a 1/2" socket and weld it to the rounded plug. This is based off the assumption that it is a steel plug and not aluminum.
When welding the socket to the plug, it should clear off any oxidation around the plug that's making it stick so it should just come out.
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