Your best bets (and this will depend entirely on what your ATAR ends up being) will be Curtin, UWA (will need 99.00+), UTAS (will likely need mid-high 99s, but very hard to predict), JCU (depends on written application, no UCAT), and Bond (full fee paying, no UCAT).
Best back up plan is a degree in a career you can see yourself doing full time should medicine not work out (with very few exceptions, non-standard and graduate entry universities accept any degree background). We have a few threads dedicated to this topic that I suggest you check out.