Looks like it will not impact us even if we join a round of Victoria's sprint series, spotted this in the latest CAMS release.
"From 1 July, 2014 all international and national circuit races, road events and off road events, except where specifically exempted due to the type of vehicle; From 1 January, 2015, all state circuit races, road events and off road events, except where specifically exempted due to the type of vehicle.
This does not include Speed events and Auto tests."