Good idea I would have never thought of, having a spare front laying around. Heck, they're small enough that someone could take one along on a long ride then switch when you get to your temporary destination.
Next questions (since I'm full of them!):
I used Sunstar several times in the past but they wore out faster than I wished they would have popping the clutch at 5 grand. I'd use them again since on this bike I don't do roll-on smoke shows like I did with the GS-750.