No idea about the visas, that is something for you to research at the Dept of Immigration site. Big issue is your licence. To work in Oz you'll need to convert your CPL to an Australian one. I'm not sure that it would be feasible on a 1 year visa. It is a bitch, no doubt about it.
Most of the aircarft you mention are operated especially in the uk on an aoc which means you will need at least 700hrs and minimum 40 multi p1 100 ifr before you would even be considered . Only place you are likely to get this here is by instructing . But as you have not stated you wish to instruct then I wouldnt bother . As said above try africa but most of that is SE for guys of your level