Ha! I forgot about my own thread.
Me and three others had a go before I posted here. We didn't get very far.
Loose and coarse gravel, lots of washboard. Four sort-of-ADV bikes, two experienced riders on appropriate big blocks, two idiots on 80/20 tires (I'm the latter). Sunny and hot, the road itself dry and in good shape.
Slow going for all of us. We could do it, but it just wasn't any fun. We met a lone guy coming from the north on a KLR. Not too tough, he said, but he warned of a washout ahead. After a whopping twenty five kilometers, we chose to turn around. Some big ADV riders we are!
My brother offered his bike to me on the way back. An identical Guzzi V85 to mine, but with Shinko 804/805. Wow. What a difference, so much more confidence than my Shinko 705s.
Experienced and determined riders shouldn't have trouble here. Budget plenty of time, have sufficient fuel. I'd advise against going alone, as there are no services of any kind, and no cell service.