Macquarie has a more established actuarial side of things and is better known in that department. If you end up deciding you don't like actuarial then transferring university ( to UNSW) is certainly possible. I know Macquarie offers exemptions with the proffessional acturial certification body...
I could only find 19 Cybersecurity masters https://www.mastersportal.com/search/#q=ci-202|di-285|lv-master|tc-AUD and none appear to be in Brisbane. However, online masters are avaliable if that is something you are interested in?
Re: Bachelor of art /bachelor of education vs bachelor of music/ bachelor of educatio
I’ve heard they are planning to phase out postgraduate diploma in education so might be wise to do a bachelor of education.