Why? Seriously? As soon as you feel any play in the crank you stop and walk the bike home.
You wanna risk it?
Best to do it properly, some LBS will have a tools that designed to rethread the thread bigger to allow a bigger crank extractor to fit, I've done that on a dozen of bicycles before.
@edscoble started
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Why? Seriously? As soon as you feel any play in the crank you stop and walk the bike home.