This worked! Using the AlexIT/Sonoff LAN integration and the eWeLink app. I bought the smart switch through:
https://www.bidorbuy.co.za/item/478221913/KTNNKG_AC85_260V_30A_3000W_High_Power_WIFI_Smart_Switch_433MHz_Receiver_Smart_Home_Gadgets_Wireless.html
Custom duties came to about R40
The...