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Just to close out this story, the above method worked. When I did get the plug out you could see the carbon buildup in the threads. I cleaned up the threads and ran the old plug in/out a couple times to get as much gunk as possible.
Since any new project requires a new tool purchase, I made a very useful one for this situation. Went to Harbor Freight and got a digital inspection camera (ie- bore-scope). Without this I would not have been able to ensure that the penetrant was actually getting on the threads of the plug.
The new plug went in as easy as the rest of them. The car is back on the road and I'm a happy camper.
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