Update: It took me extremely long to find out that I can register a LHD HZJ79 (that's the single cab Land Cruiser with the old style 4.2 liter inline six diesel) in Botswana, as a tourist, that is without having to fabricate a proof or residence or even a residence permit.

I ordered a new LHD HZJ 79 from Belgium which cost 35'000 USD (all amounts equivalent local currency and approximate) including RoRo shipping to Durban. I paid 10500 USD for Botswana import duty and VAT. To get the car out of the port and registered in Botswana, it took three different agents who charged a total of 6000 USD. Total for the base car 51'500 USD.

So I'm OK, thanks for the help.

THANKS for the update! Best of luck on your travels