I posted a link to a recipe for making kefir from young coconut and I see no reason why a yogurt culture would not work as well.
Here's the link.Here in the US, YoLife cultures are non-dairy:
"A non-dairy mix of dextrose, Bifidobacterium longum, Lactobacillus acidophilus, Lactobacillus bulgaricus and Streptococcus thermophilus"
Google "Non-dairy yogurt culture to locate a source for a similar product in Australia."
Or you can contact
Cheeselinks and ask if their cultures would be suitable.