Sunny aren't you a member of the SAAA and have you looked at their comprehensive website?
If you look for the article by David Francis you'll see that you only need for the transponder to be TSO'ed and most of them are these days. You also only need an approved radio for Night VFR.
The only dodgey thing I've seen around where you are headed is using the Dynon's non-TSO'ed built in altitude encoder coupled to a TSO'ed Garmin Transponder or similar.
Why not look at the Levin AHRS unit that talks to the iPad via wifi. For around a grand plus iPad you have a unit similar to the Dynon display at a fraction of the cost and software updates are the only limit for what can be displayed.