There are multiple public transport options in most countries, some more adventuresome than others. One segment to be aware of with less than regularly scheduled serivce if Wadi Halfa to Dongola. The once a week ferry drops everyone off, and you would want to catch any transport south otherwise you may have to wait up to a week until the traffic picks up again. You can always be lucky and catch someone heading south, or perhaps hook up with some overlanders as everyone gets backed up waiting for the ferry. All doable, much patience required as you know. Personally, I'd prefer the freedom of a bike, but any adventure is good adventure.
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