I followed the route as described and almost got cliffed out. Ended up on some very loose Class 3-4 dirt and scree ledges above Crater Lake. I'd suggest first going NE from Crater Lake and getting around the big white granite cliff on the right (east) before heading up NW. The going is much more gentle without and exposure. I'll post a beta photo too.
"As an adolescent I aspired to lasting fame, I craved factual certainty, and I thirsted for a meaningful vision of human life - so I became a scientist. This is like becoming an archbishop so you can meet girls."