Jigglypuff
Skaapstekers and red lipped heralds are both nice choices. I assume you are just looking for a mildly venomous snake as a pet not as practice for a hot. You can get both of these quite easily on permit in the Western Cape unless things have changed dramatically, but personally I would try to get an eastern tiger snake Telescopus semiannulatus. To me these are just stunning and they are relatively often bred in captivity. Babies are difficult to raise but with a bit of patience and research anything is possible. Envenomation from this species is mild and generally uneventful so all in all I reckon that would be an excellent choice. You couldn’t ask for a more beautiful mildly venomous snake in my opinion.