Welcome CJ7. Welcome to the madness that is jeeps.
Am from Adelaide, and no, I dont know any mechanics to work on your CJ7.
best person to speak to is probably Glen, from mt Barker 4x4. he drives a TJ, has an ARB agency, and is generally a very knowledgable Jeeper. He'll point you in the right good direction.
Where in Adelaide are you? Am in the Hills myself . .