Andrew Seyderhelm has returned to Brisbane recently and runs Systema classes in a variety of locations, mostly on the north side. A dedicated Systema student, he is a "FULL INSTRUCTOR" in Combat Systema
and an "INSTRUCTOR" in Ryabko/Vassiliev Systema, and to date is the only such in Brisbane I think.  He runs good classes and aiki skills are quite transferable to learning Systema. Andrew also organises senior instructors from overseas to visit, usually annually.
http://www.systemaaustralia.com/