You need a GPA of 4-4.5 to transfer into BBC at Macq from BBC at UWS. That's a credit average and is VERY easy to achieve.
I was deciding between UWS and Macq last year as UWS was 5 mins away from my house while Macq was 2.5 hours away (1 way). I chose UWS due to its close proximity but I'm having doubts as to whether I should transfer or not. I've asked them and they said with my GPA I'm guaranteed for transfer into Macq (as well as UTS) but idk, I prefer waking up 10 minutes before a lecture and getting there with 2 or 3 minutes to spare haha.
Macq only look at one semester of your results. So, either semester 1 or semester 2. You submit whichever you want.
I don't really see any point in doing a totally different course at the same uni so you can transfer internally to the course of your choice. Why bother being a year behind your studies when you can do the exact same course at a different university and transfer after 1 year?