I'd be doing it from holden, because I'd be coming from Stehekin, and going out to the Entiat and up just wouldn't make any sense. Klenke, that pic helps a lot, it sounds like there are some loose gullies at the headwaters of Copper Creek: but once that saddle is gained, I agree that the south side of the east ridge looks fairly class-3 doable. Trip planning is addictingly fun.