I can’t see any foreign regulatory authority allowing the Max into its airspace without an extensive modification of the stall avoidance system and an in-depth training program for Pilots and engineers. A separate type rating covering the Max, rather than relying on a current B737 rating is a real possibility. A new type certificate might also be on the cards as well.
After two disasters, no authority is going to sign off on a solution unless it’s iron clad and well in excess of what’s required, a software update isn’t going to be enough. No pilot will be flying a Max until he’s demonstrated proficiency in dealing with any possible MCAS failures a simulator.