I live in Brisbane, can anyone recommend a brand of komboucha. The ones I’ve seen have low sugar but have stevia added which is a nono on the bloodsugar diet as the brain still recognizes it as a sugar.

Have you thought of making your own? There are websites with instruction s. Once you have bought your equipment (not a lot) and bought the fermenting starter you need never spend anything again.
Haven’t managed to start doing it myself but I did read up on it and it looked easy.