If the lower ledge that leads to the northeast ridge (aka East Ridge) can be done then the ridge itself to the summit is not very difficult (Class 4 - 5.2) as long as you can get by the cornices that always seem to hang in the notch beside the super buttress. I've looked off the gap beside the buttress many times and most of the time there was a 10-20 foot hanging cornice in there. From your photo it looks like you could just squeek by them. The top of the super buttress also blocks the ridge from the north but you can easily traverse below it on the northern (Rock Creek) side of the mountain.
The upper ledge that leads to northeast ridge is the one that Mike and I traversed to get back to the north face for our descent. I couldn't remember exactly how we got over there until I saw your photo. The traverse is pretty easy but the exposure is out of this world.
FYI - We were planning on going up the water streak just to the left of where you started and continue with a "directissma" straight up the upper two bands. And like you describe, the steep "grey" rock on Borah is for the most part pretty solid and fun to climb.
Again, awesome job man.
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