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How is the fit of the lower woodruff key? It looks like the flywheel nut came loose, sometime in the past to cause this damage. If the lower keyway will hold the woodruff key in place while installing the flywheel, you might be ok. The woodruff keys [flywheel keys] really only position the flywheel correctly on the crankshaft. It is the crankshaft taper along with the taper in the flywheel hub that provides a friction fit to hold the two together. How does the rest of the crankshaft taper look on the other side? If all else fails, a used crankshaft for a PO shouldn’t be hard to find.
Be sure after you complete repairs, to torque the flywheel nut to 65 Ft. Lbs. Use a strap wrench and a good torque wrench. I like to check mine periodically or before a club wet meet when i plan to run the motor. I’ve seen a few of them loosen over time, so check them to make sure they stay tight.