Arlec Grid Twin Plug, available from Bunnings in Aus.
Tuya-Convert 2 required. Once flashed, updated firmware to at least 6.6.x.x to enable button control of both outlets.
Switch 1 is the lower outlet, Switch 2 is the top outlet. A single press of the button will toggle the lower outlet, and double press will toggle the top outlet.
This template also flashes the revised model PC289HA.
Update 2021/02/22 Tuya-convert OTA failed for this plug due to its factory loaded Tuya firmware (PSK identity 02).
This plug contains a TYWE2S module which was simple enough to solder pins.
Plug casing uses common Y-type tamperproof screws. It does require a significant amount of force to separate the locking clips located in the middle of the case.