Hey Jez...
Given this is an easily identifiable plant and found readily around SEQ, I too have been sucked into researching this thanks to the miss-information found on Wiki. I've tried at least 4 times using various AB and STB methods on fresh bark (100-200g each time) with absolutely no positive results. I concur that this Acacia is not worth wasting time and money investigating further. The info on Wiki is really quite deceptive and I'd hesitate to trust it in future as a point of truth for DMT related claims outside of the well documented sources.
In saying that, I'd be very interested to know if anyone has experimented with any of the native Psychotria species with positive results?... furthermore, has anyone had successful results with ANYTHING not currently documented? ...like Eucalyptus, Banksia's and other OZ natives???
Cheers