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Did you use anti-seize paste when you installed them?
At this point it sounds like you're kinda committed to turning the plug until it either comes out or snaps, and then dealing with it. And, if it does come out without breaking, what will you encounter putting the new one in? Will the threads in the block be damaged?
In your situation (daily driver, needs the car on the road), I'd be looking pretty hard at towing it in to the mechanic. And it's usually cheaper to fix if you send it in before you break it rather than after.
Good luck!
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'99 black 986
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