Tom it took me a minute , Khanacross is what we call Rally cross and Motor Khana I think is what we call Autocross i.e. big parking lot with coned course.
First congrates on the result and congrates on getting out there and doing it. As a Rally and Rally cross organizer I meet guys your age who want to do this kind of thing but feel they must at least have a WRX , can't be racing an old Datsun or Corolla....good for you.
Next take your Datto out whether it is competitive or not it will be fun even if your just racing around a big parking lot. (my 11 yr old son runs a Yamaha KT100 powered Kart at local Autocross.)
Do you guys in Tas have track days. In the USA we have performance driving days where you can bring a street car and run round the track (I instruct with two groups) At a Porsche Club day we had a student in a bone stock beetle.
Racing can be done cheap if all you care about is having fun. When I ditched my road race motorcycle and got the 1200 I had $1800 US in the car including the price of the car and it was still street legal. Many folks asked why I would run something that slow to which I replied "it's faster than a set of bleachers" The car had a bone stock engine at that point.
Anyway congrats again and keep doing this in about 5-10 years , like most of us you will find you have the income to do more.

Tom Grossmann