This route starts immediately to the right of the large fir tree on the north face of Supremacy. Follow an obvious, wide seam up angling slightly right toward a small tree. Just above the tree, stem out left onto the face and follow a pair of shallow cracks to the left. After ten feet, head up and right again on a broken-up seam. Finish by traversing left again on a ledge to the large alcove at the top of the NE arette.
The pro is probably reasonable, though creativity may be in order. It is probably easier to top rope along with Supremacy Slab.