Hi Pillymonkey,
As far as I know, if a bridging course is good enough for you to get into uni it's good enough for dfr. I did a full adult tertiary prep course at TAFE a couple years back to get into uni and dfr were happy with that. Have a look around for some courses and give dfr a call to see if it would be acceptable. It just has to be Maths B equivalent (I'm from qld, I believe its called something else in nsw). Hope this helps