Are you still a student clocks off, or have you validated. If you haven't spent time at a uk unit and validated your ratings, you're going to find it impossible to gain credit for what you've already done. As pretty as the CAA license is, it's much akin to a chocolate teapot when not accompanied by a validated rating.
Shannon, Eurocontrol and NavCan (not too sure about OZ) will make you go through their training if they accept you.
USA is out of the question, unless you fancy going and flipping burgers for 2 years to possibly become a citizen, and then applying to become an ab initio trainee.
Sorry to be negative, but without a couple of years post validaiton experience, there's FA chance