I'd recommend getting the Jackson/Ortenburger guide if your doing this kind of stuff in the Teton's. Certainly seems doable from looking at the photo and a topo. Like most Teton routes you should be comfortable with some down climbing and take your time route finding. From the route description you gave it seems they were making it up as they went and it worked. You may have to do the same. Afraid I I don't have any specific beta to add.