If you want one, get it together and do it now. Values are going mad and it just pushes up the duties, never mind the hassles involved in getting it out of SA without getting burned. An 8k bus quickly turns into a 12k bus by the time the bills are paid.
SA-specific spares are a nightmare and I don't like thinking about it
Syncrohospital is one source, there are a few breakers I understand but it's the whole export/import problem and it's along way for things like window glass. You'd end up getting some made here and arguing the toss with your insurers.
I do know of a 2.5 caravelle that may be for sale (not mine)
1985 Oettinger 3.2 Caravelle RHD syncro twin slider. SA Microbus bumpers, duplex winch system, ARC 7X15 period alloys