Hi Cilantro,
I'm just probably going to suggest things you can do.
Since your GPA is 6.3 at the moment after the end of year 2, if you H1 everything (4 subjects in Sem 1), you can bring your GPA up to 6.65 which is not super competitive but I'd say gives you a decent shot assuming you have a good GAMSAT to back you up + or if you are willing to go interstate as well.
With regards to your FFP DVM spot, you can take this spot and do well this year and get bumped up to a CSP DVM spot. What I'd do probably and just fill in the MD prereqs since yes, it doesn't matter what you major in as long as you have done the 3 prereqs. On top of this, I'd do the so called "bludge" breadths to bump up your WAM (for a bump up for the DVM CSP next year). Assuming you can afford FFP DVM, You can get started on the DVM, potentailly get bumped up to CSP or even jump ship to the MD/MBBS if your GPA and GAMSAT + intervieew are good enough.