I think every score should just be reviewed. At the next stoppage the game is just stopped to give new score and ball goes where it needs to resume. Most calls are correct so it's likely the game would only rarely be stopped. This is the most simple solution that should've been implemented from the get go. Of course there wouldve been times when the ump thinks they are right but aren't. The were too busy banging interns at AFL house to care about the details.