Why not dive right into the Evolution over Wallace Col? Drops you right into the heart of the Evolution. The east side of Wallace col is unclimable scree, best to return over a different pass like Echo Col or Lamarck Col.
August... EEK! Be prepared for a talus slog. No snow to make the ride smoother in August!
Wallace Col drops you right into the Evolution here:
East side of Lamarck Col (class 2)
East side of Echo Col (arrow) (class 3)
East side of Echo Col (carrow) (class 3)
West side of Echo Col (arrow) (class 3)
West side of Echo Col (class 3)