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Turning the hex head counterclockwise will extract the crank, assuming you can get it turning. If that works, no need to take off the extractor ring, and no need to use anything else to re-install.
There's a good chance you'll have trouble removing the extractor ring, since those pin holes don't provide much purchase.
The fact that you got some movement suggests that the bolt isn't frozen—you probably just need to push (or pull) harder. I'd use a good hex bit with a socket wrench, and take care not to round the bolt recess.
If it doesn't budge, rather than WD-40, get a real penetrating oil, apply liberally, tap the part to aid penetration, and wait a day. It looks like there might be some rust involvement.