Benjimoomoo,
I have gone through the whole selection process lately and I don't believe they care how you got your minimum requirements. If you pas the benchmark, you pass, that simple.
Btw, how come you can only see the PPL as an alternative? A TAFE diploma should be pretty easy for someone who aspire to be an ATC, and much, much, much, cheaper than PPL. I'd certainly go for that if I was in your place, moreover, you might even get a job with a diploma (don't expect the same with your PPL)