Little experience with Bajaj Pulsar 150cc
To me, it sounds a great idea!
We rented a Bajaj Pulsar 150cc in Nepal and rode it 2-up for some 7-8 days and I liked it quite a lot. Can't tell how many kms, since the speedo was not working, but some hours a day. Carrying a (reversed) day pack on my chest and a North FaKe duffle on the back of my girlfriend we had not much (at all?) space to move, so not very comfy, but not worse than my XT600. Solo riding should be far better.
I am quite inexperienced to give proper opinions about bikes, but I found it had enough power, we were the quickest on Nepali roads, at least. Some gravel roads witn no problem, since it is very light and the seat is low, although enough clearance. Tried also a 200cc and enjoyed the extra power.
It has to be reasonably realiable (although being Indian! I am not a subcontinent big fan) and spares cheap, since we rented it at 7-8€/day and they make profits even if you are riding hard roads.
So, being a "crappy vehicles lover", I find your idea really cool. If spares are easily available, I'd say, GO FOR IT!
PS: If it is a South African bike you do not need a CdP?