I don't think it will work.
Just too different, but if you are looking for South African troops, circa 1970-80's here is an idea.
Vietnam era Australians.
Same type of soft bush hat, SLR rifles, web gear same or very close.
There are extensive lines of Australians available.
Assault Group –
link
Empress Miniatures -
ageofglory.com/anzacs
Also:
Butler's Printed Models has released the Ratel IFV –
link
For Centurion tank there are 2 very good options:
Empress Miniatures (from Age of Glory in US)
link
or
Blitzkrieg Miniatures (from Sherwood Miniatures in US)
link
I went with the Blitzkrieg version.
Both companies make top of the line products, just a personal choice as I think the Blitzkrieg a bit better match for the 1/56 vehicles I use.
You might have guessed I'm currently assembling a SA force for the 1980's.
Where do I find figures that I can use as Cubans?
Ah, there you can use Mongrel Miniatures from their Syrian/Soviet lines.
link
link
link
the above companies and several others make Soviet era vehicles and AFV's to equip your commie forces.