Depends on whether you're ready to give your dreams of dermatology/ GP a second shot or not.
I feel like most of the options you've listed are valid ways, although personally, I'd be more inclined to attempt either the [insert an undergrad degree that would allow you to do postgrad med] + attempt for postgrad med option or physio/ nursing degree. If you want, you can even do both (undergrad physio or nursing, then postgrad med), from recollection (although I'd check on this first before doing that).
There's also the option of sitting the UCAT and taking chemistry in first year uni. (Of the unis that offer undergrad med, some won't let you enter via this pathway, but this is still an option nonetheless, so definitely see if Monash or any interstate unis will allow you do to this and act accordingly.)
Not sure if that helps to clarify your decision, but hopefully it's helped to see that you still have quite a few options left.