I like the idea of 400cc bikes for SA, I'm thinking that is about the perfect size to be able to really venture off the beaten path in SA and still be able to get down the slab when you need to.
Did you look at trying to add the kick starters for backup? I think the DRZ or a modified Honda XR400R with electric start added of 400EX are the perfect ticket, I just really like the idea of electric start plus the back-up kicker. Just have to do some more research into gear choices...
Really like your choice of the see through safari tank on the dizzer
This looks ripe for adventure