I live in Florida and ride in the summer here out in the scrub that is Ocala National Forest. Featureless terrain; bushes sand and pine trees. Very easy to get lost. The humidity is so high and temps in the 35c range that you must have a camel back and drink constantly and load your body the night before with water. However, even acclimated, if something happens 6 hours in and you are kickstarting over and over, picking up your bike, dragging it through the sand, etc, the overwelming heat starts its smothering effect and your body temp starts to rise. Just to do that for 12 hours properly hydrated will wreck your body, but at 47c and after days of this in the desert, any stop or failure immediately puts you at risk. You are already started down the slippery slope. Your advice is really only the bare minimum you could hope to pull this off in this kind of heat, you will still need quite a bit of luck on your side.