You can't leave that front sprocket as it is. It's dead. I'm surprised it isn't already throwing the chain and slipping.
You HAVE to change it as a matter of urgency.
If you put good chains on bad sprockets, it will just destroy the chain very quickly.
You need a new shaft.. It's that simple... An expensive PITA, but that's the truth of the matter.
If you can't change the shaft, then you will have be very careful and re-weld a new sprocket on the front. Put the chain on and make sure it is in line before it is welded on. That is what you will have to keep doing. But it's not something I would recommend.
I can't think of anything else you could do.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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