I think you'll have a very hard time getting this off the ground. Theres a guy in QLD thats trying to get a JDM racing series up and running. Its open to ANY car made in Japan as long as its still has a Japanese engine. From what I understand the turnout wasn't great and the numbers were made up by MX5 club members. You've restricted yourself even further than that guy by going for a single chassis and engine combination. I think your best bet would be to tack yourself onto Saturday afternoon sprints or Time attack and run with their format and compare times at the end of the day. It wont be door to door racing but it'd be a start.
If you want door to door racing then you're throwing another stick into the works. You could still tack yourself onto an event like top gear or even the JDM series but then you require a roll cage (cams approved), harness, kill switch, fire extinguisher, race suit and a few other things. So the cost to get into the event in the first place would most likely rule many people out.
I think you should just get out to the next SAS (September 15th, I should be there) and have a go first.