Stripped keyway

1990 montero -

The balancer came loose and is stripped out pretty bad, the crank shaft took some abuse - the keyway is now oversize in front so it allows the timing belt gear to have some play. I can't get the timing gear off the crankshat because the key is deformed, I need to get a gear puller I guess. The gear it self may need replaced - and I may have to damage it to get it off.

I'm pretty sure I need to replace the balancer, but can the keyway on the crankshaft be repaired?

Without tearing down the engine, that is.

If I need to pull the engine apart then it's not worth it.

I saw on the web that JB Weld could be used - that does not sound like a very good solution to me but a this point I'll give it a try if it stands a chance of working.

So. What are my options?