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I've seen people stack two aluminum pedals together on top of the brake pedal to raise it for track use, I'm sure you can do the same for the clutch pedal.
I fabricated this 1.5" extension out of a piece of wood. It cost next to nothing and is easy to do if you have belt sander. At 5'6" with a 29" inseam this makes driving much more comfortable and enjoyable. My only regret is not having done it sooner.