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.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe