Did this today after a good chat with Alan Cassidy last night who described the line I ended up taking:
From the ripple I pulled on the "resting pocket" round right, did a really cool "poor man's Kaluza Klein manouvre" to swing around onto the right, laybacked a tiny seam on the left and got my foot in the slopey notch on the arete, and good holds from there (couldn't place gear during any of this). Definitely made sense this way. I can see it would be possible to purely layback on the left but that would be quite hard and quite eliminate as the pocket doesn't lead you that way. Happy to take the natural line of least resistance, even if it's easier - felt pretty steady with 6 RPs and Offsets in the crack.