I believe a draw with the RAW is possible. Two players table three opponents, and each game plays on such that those players score max points.
Strength of schedule could produce a tie-breaker, yet I'd also like to offer as a tie-breaker the winner being the player with the fewest Victory Points lost over the course of the day. It's like a measure of efficiency, and has a solid identifiable number.
The idea, take it, leave it, it's there. I'd prefer to look the fool now and have a clear solution ready, rather than not say anything at all and have the store seemingly make up something at the last minute. (*I* know the store doesn't roll like that, but there's lots of people from all over coming to these tourneys.)