Hello vagabond2020 and welcome to the forum,
It sounds like you have given this some thought but my first observation is that your proposed route across North Africa is not currently possible starting with Algeria being off limits as is Libya further long. It is possible to head down through West Africa from Morocco all the way to South Africa where you can turn around and head back up the east side if you have a mind to.
I suggest that you start by reading a few of the ride reports and see what routes other people have taken and during what seasons they were there, you will find yourself spending more than a few days or a couple of weeks in some countries.
Hopefully others will be along to make suggestions as to which route you might think about, the other thing to research when planning your route is which countries don't allow US passport holders, Iran and Sudan both make it difficult which is a shame as they are great places to visit but there is usually an alternative.
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