We just did the Turkana route 2-up alone and killed our poor old bike's frame in the middle of nowhere (between South Horr and Baragoi), so we're now in Nairobi with a broken frame (after being dragged out of there for a good $$$ of course) god knows for how long. We were fortunate to get help the same day (only 2 trucks per week go through this route), so yes, you're right, I'd not recommend doing it alone. In any case, take PLENTY of water. You should be able to get petrol along the way from a barrel (we did top it up in Turmi, Omorate and Loyangalani).
Maybe see you in Nairobi if you're hearing that way!