Show multcurrency only in 1 language

Hi,
I have a site with 3 regions (translation), Australia, New Zealand, and SEA (Southeast Asia). I would like to show the currency switcher only in one of the regions. For example if someone visits the Australia site they will see the prices only in Australian dollars, but if they visit the SEA site they will see the option to switch to another currency.

I hope you can calp me with this.

Thanks