I'm glad you explained that cause I was thinking the wax worked like some sort of lubricating loosener instead of a heatsink. Maybe I'll get a chance to try that some time or some variant. Old dogs love new tricks.
Maybe you could soak it with some type of liquid wrench. put a strong bolt in one end and just try to rotate it with a socket & breaker bar or impact wrench to free it up. That is if there is no key or pin.