It ain't easy!
we just bought an XR250 and an XLR200 (hondas) in Tanzania. 250 parts are quite common through southern and eastern africa, but you have to be careful; models vary between the US and africa.
I'd go for hondas. whatever you get and whatever parts you need, they'll be found definitely in SA and probably in Kenya, so could always be shipped (+++ cost & delay!)
p.s. africa is full of land cruisers! it may be easier/cheaper to fix of a land rover but that's because your doing it so often!
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