An Argentino rode two horses (Mancha & Gato) from Buenos Aires to the World Fair a long time ago....four 'hoof' drive, good suspension & gas mileage. Dont know if touratech do boxes of racks for them. ;-)
Getting parts has been an issue in S.America so I'd expect Africa to be more challenging. Luckily I've had lots of help from BMW London when I've needed to order stuff, I'd recommend taking a few cases of

to your nearest dealer and asking nicely if they would do the same for you.
Other things that spring to mind :-
- chain tension adjusters on the swing arm work loose & fall off
- take some shims so you can check/reset the valve clearances
- ignition lead can easily rub against things & that screws it up
- stones get caught between the radiator & frame making a hole (plug it with foam)
- oil sump plug is made of chocolate, very easy to round off the head (take a spare & 22mm 6-point socket)
- copper grease the fork brace bolts or they'll seize & shear when you need to change fork seals
- fork bushes last around 50000 miles & mine are on the way out
My bike has had a hard life so its no surprise I've broken stuff, but I'd still rather eat worms than ride a Honda.