Australian, ex SA adoption

Hi - my wife and I would love to adopt a child however the roles and tape in Australia make it difficult, we are 40 and 46 yrs old with no children of our own. Being ex-South African with lots of family there I was thinking of moving back for a year. Is it possible to adopt a child in South Africa with plans to move back to Australia in a few years? I guess there is issues on both sides, adopting and then legally bring the child back to Australia. Any feedback would be most helpful. Thanks