I'll be the contrarian.
We got rid of a similar method in our local high school league: 3 holes match, 3 holes match, 3 holes match, 9 holes match.
Keeps the lesser player in the game (if that's the goal, you have your format.)
The only thing that would make it worse is if you played it at match play, and not medal play.
Medal play determines the better player.
However, if you are looking to mix things up, it's definitely a deviation from the norm.