I just took the recommended route (south branch of north fork of Deafsmith) yesterday to the Twins and just wanted to add something to what was written by PellucidWombat:
"I scrambled up the middle of the east wall of the bowl to a narrow part in the cliff bands. Here is is a bit of a scramble for about 20 feet.
Since I didn't initially come up at the summit, I don't know exactly where to go from there, but what did work for me was to start hiking towards what appeared to be the highest part of the peak. If you miss the summit, you might have to drop a little ways back down the slope to circumvent some larger blocks that surround it. Searching below these blocks, a faint route can be seen. It is a modest scramble up the rock to the top."
After that narrow part in the cliff bands of the east side of the bowl, keep more to the left than to the right. I went for the highest part of the peak, as stated, but at some point ended up going more to the right, which took me to a saddle between the west Twin and a smaller summit to its south. It was pretty, but I had to back down a ways and then aim more for the left. Except for the bushwhacking lower down the canyon, I highly recommend this route. Smooth sailing.