When I buy a used car I Really don't concern myself much with warranty coverage. I consider used perfomance vehicles both two and 4 wheel to be a little bit of a gamble.
Maybe have the dealer put in the new clutch and sell the car and move on. Or have a shop put in an aftermarket clutch and welcome to the family. How much coverage is left on a 2013? I think my 2013 is out or nearly out of coverage. Are you able to do the clutch yourself?
2013 gt premium m6 3.73 with lots of aftermarket bits