Then you end up with students from places like Nepal and Pakistan, where cheating is so rampant that you can't really evaluate the quality of your medical student or applicant. Even standardized exams like the USMLE/STEP series have been gamed. You also end up with significant cultural mismatch. I don't believe this is a good solution.

It might not work for the other countries.

anecdote alert: had a family member treated by a foreign doctor last year, and received advice from that doc that was both 1) highly dangerous, 2) bare minimum 20 years out of date.

Inconceivable that a domestically-trained doc would have made the same mistake.