hi, getting Australian likes only is a matter of being selective while targeting your campaigns and ads, so yes it's quite easily possible with a proper campaigning. we do storified social media marketing campaigns where we first design a core brand story or marketing story for your brand and then design rest of the marketing content based upon it like ad copies, landing pages, social posts etc.
but before anything i wanna check your website, so that i can advise you really relevant campaign stories, and not generic advisory. will wait for details.
Best, Gaurav