Hello James, as no one else has answered... I traveled this route earlyer this year. Egypt is full of tourists and the main roads have a very heavy police presence I would have no worries about riding the route I did then, now. Sudan has problems, I was concerened about them before I left, the old troubles in the south, Dufar in the west. But the normal route Wadi Halfa to Dongoal to Khartoum is so far from those troubles it is not worth worring about, the little villages along the nile were so pretty and were genuinly the friendlyest people I came across in Africa, take time to stop and say hello. Eithiopia is not a safety concern, North Kenya has a reputation but along the Normal Moyale-Masabit route I think is fine now and has't been any trouble there for along time. The area aound lake Turkana there are bandits. I met a 4x4 who had been robbed there in Feb. When friends and I passed throught (2 weeks earlyer) there were bandits in the area and they clashed with the poilce. North Kenya is wild land, always has been and always will be. But for overlanders not really a problem, Im sure you will bump into other travelers along the way and often are happy to travel together for some sections.
Hope this helps, have a great time, I wish I doing again!