One of my daughter’s has Coeliac disease and she can be sick even from tiniest bread crumb. I can tell you with confidence that most chocolate is GF. You can use Callebaut, or even go with cheaper options, like " Cadbury", “Signature Range” or “Pams” chocolate drops or even buttons. As long as they don’t contain Barley extract, wheat glucose syrup. I live in NZ, I would say that it will be same for Australia. I hope this will help. xoxo
Gulnaz Mitchell, New Zealand, https://www.facebook.com/pages/Heavenlycakes4you-by-Gulnaz-Mitchell/113619242162187