the taper is what was used, for your purposes, there aren't many options.
Pull the crank and have a keyway machined into it.
Swap the crank for one with a keyway in it.
Go shadetree ...
Weld a tall bead run into it and cut/grind it back to keystock dimensions.
Drill some deep "dimples" into it and red loctite the screws on a centrifugal clutch with at least 2 set screws.
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