You can safely patch the tire if the nail is in the tread (i.e. not sidewall)...no need to incur the cost of replacement. Use a reputable performance tire company and they will remove the tire and install a speed rated patch. If they are good, they will warrant their work. Cost about $50.
I have done so twice in the past, and even subsequently tracked the car with no issues. I would have zero concerns for street use only.
It would be more of an issue to have 2 tires on the same axle with different levels of treadwear.
Porsche dealers sell tire insurance, and are thus motivated to hold the line on the "cannot patch"issue.
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