If the starter pinion and the ring gear are compatible, I'd suggest changing the starter drive out for a new one, and maybe flipping the ring gear over on the flywheel to get a fresh set of teeth exposed to the pinion gear. It's not terribly difficult to do if you have access to a torch to expand the ring gear once you tap it off the flywheel with a hammer and a soft punch.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!