There are people who ride without a spare clutch cable?!? 
I have one fail about evert 100K miles.
Same advice for carrying a spare throttle cable. (Haven't needed that one yet, but loss would be debilitating)
Not really, it doesn't take long to adapt to not having a clutch, start off in neutral push off and slip into gear, or crank it in first gear, change gears slowly and deliberately.
I had to drive an Austin Healy through Sidney Australia without a clutch.
The last time I broke my clutch lever about 30 miles out of John Day, made it in to town where I found a lever at the Polaris dealership, the owner took us back to his place for the night.
My riding buddy has a spare cable installed on his Z1.