There is another route avoiding the climb up the FOG which I followed in 2013 taking me to the top of the Falls from Dornie. You can follow my trail on Social Hiking:

Aussie Mikes 2013 TGO Challenge

Just zoom in to Dornie and follow the orange path.

I plodded up the east side of the Gleann Gaorsaic the following day. It was mostly untracked and mushy but not too bad compared to other bog hops I have done on the Challenge. The views were awesome and there were several fast running but narrow streams to cross. Most I just hopped over!

If I remember correctly, when I was coming down the hill to the top of the falls, I met Willem coming up!

Cheers,

Mike.

Re alternatives to the FOG route, has anyone tried the route further west, passing Eas Ban and going over Bealach Con? There is of course no bridge over the Elchaig at this point but maybe you could follow the south bank from Camas-luinie and Coille-righ?