Hi Adam, Gwydir Valley Models is the Australian agent for Fasttracks.
While I have not used their tools for 12mm I have made use of their filing jigs to do a few 32mm gauge points and they really made the job much easier and more accurate than my old home made jig.
I think the Tillig product is still the only dual gauge option in RTR track although Shinohara and others do plain 12mm gauge. You might try the 3mm scale society pages for 12mm gauges if you want to have a go at dual gauging some existing trackwork. Peter Betts used to supply them via AMRA for Shinohara code 70 rail section but they would be collectors items now. I guard mine jealously :>