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For the Boer war you would need some Indian stretcher bearer, Ghandi himself serverd there.
Beside this there were no Indian combat troops there as far as I know.
As for the Trekker-wagons etc. Jacklex has a very good range of colonial wagons etc. I am searching for the old Qualiticast bigger colonial wagon, missed this one when I bought the range some years ago. This would be a fine one too.
Maybe HAT would add some Swazi warriors to their growing colonial range to cover all the armies that fought in the Zulu-war.
The Bengal lancers you could use for several campaigns in India from 1884 onwards and for the Boxer rebellion.