The other option from Wasdale Head would be to go back up Sty Head Pass and hang a right at the top. This would take you over Esk Hause to Angle Tarn, from where you could drop down Rossett Gill to Dungeon Ghyll.
Another alternative would be to go up Ennerdale, then go over Scarth Gap into Warnscale Bottom and then back up Fleetwith and over the top to Honister. You could then drop down Honister Pass to Seatoller, then hang a right up to Stonethwaite and over Greenup Edge. That would let you drop down Far Easedale Gill to Grasmere, from where you have a choice of absolute bastard routes up and over the Helvellyn Ridge.
Not easy going by any stretch…