If you have no interest in pharmacy, don't do it. It's a no brainer. It's your life and you'll have to deal with the consequences and put up with the horrible years in a course you might not like.
There is a massive oversupply of students and the market for pharmacists is drowing in surplus labour and workers. There's simply more jobs than pharmacists. People get a little desperate and you'll find people who would work for offers or pay they previously would of not considered under the circumstances. This is compounded by the several large pharmacy chains out there who are really in it for maximal profit (recent news stories will show you this). There is no use staying on a burning ship when you're surrounded by water. RMIT is also opening up another pharmacy school, so even more students, near the same amount of jobs.
It's not much of a fall back if you don't want it, don't like it and the job prospects are kinda shady.
Bcom/Bsci (for a year, please do a full year, it'll be worth it) will allow you to see if you're really into academic science or academic type commerce and move around accordingly. A year is nothing. Lots of people i know switched to part time, took a semester off, failed a couple subjects, decided to transfer, ect. A whole shitload of people take longer than their stated duration of their degree, a year is really nothing to find something you like.
Nacho, I'd suggest BSc/BComm and make sure you take the right subjects that can land you into Melbourne's MD (otherwise you might find yourself down at Gippsland Monash
)
Or deakin geelong.