The pursuit of autumn color in a climate unsuitable for it is a pitiful colonial exercise.
That being said, I found that there are some Ficus species found in South Africa that have a deciduous period but I haven’t found good pictures on iNat, so if you come across in your identifying please let me know.
I have noticed that in places with longer and harder winters, more people seem to be knowledgeable in the identification of dormant branches. So many lower latitude places that have plants that are seasonally deciduous even for a short period do not have observations in their dormant state. Even within the US, in Northern Florida there is a great number of deciduous trees but since the winters are mild enough most people make observations of other things instead or resources for identifying are not available.