The Australian alternative XB6AS8349B for the is ZB6AS834 -
https://www.schneider-electric.com.au/en/product/ZB6AS834/red-%C3%B830-emergency-stop-pushbutton-head-%C3%B816-trigger-and-latching-turn-release/?range=631-harmony-xb6&node=158845025-heads-for-modular-buttons
The Turn key version of this button is ZB6AS934 - https://www.schneider-electric.com.au/en/product/ZB6AS934/red-%C3%B830-emergency-stop-pushbutton-head-%C3%B816-trigger-and-latching-key-release/?range=631-harmony-xb6&node=158845025-heads-for-modular-buttons