One can avoid going up through the nasty rock area entirely by traversing through steep meadows from the Boundary-Stevens saddle. Stay at about the same elevation as the saddle until you make it below the last rock formation and then gradually start to traverse upwards. Don't stay too close to the rock wall as it gets steep -- but just a bit below. On reaching the next ridgeline after the rock formation, turn left and scramble upwards wherever is easiest to the ridge and head from there to the summit.