Assuming it's for your XR and you want to ride the pistes, I'd try and calculate my tyre wear so I did not need a new one in RIM or Mali.
Go down on any tyre while carrying a knobbly spare. At the Mori border stash one for the way back and fit the other. Or get a car to stash for you in advance.
Otherwise a road or trail tyre ought to get you there and back, but will be poor in sand. I suspect the chances of finding decent, right-sized tyres out there, especially a 17 or in Mori, are pretty slim and getting bogged down with freight will cost. North Morocco will have tyres (but then it's nearly Spain).
Ch
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