Pokersnowie gives the answer I expected: it recommends a mixed strategy. It advises to raise 38% from the button, and recommends playing a ~58% range from the sb but lots of hands are limped with others raised. This is about what I thought would be the GTO solution, but it's complicated as fuck:

Green is raise, yellow is limp, yellow with writing is to raise that % of the time.

Looks like it wants us to raise roughly 20-25% and to limp roughly 30-35%. Overall can play 10-20% more hands by playing a mixed strategy than raising only, but 10% less hands than limping only, but is clearly the optimal way to approach sb play. Just hard for humans to follow that chart even when using suits to randomize play.