Australia will only be interested in what you're currently doing, the ADF will have no interest in taking you on to do something else. We are looking for senior experienced types to fill gaps. Time frame would be 18-24 months to get through the process. They're generally looking for your E6 and senior O2 on the verge of 03 types.
Once you were here, I would imagine there would be some style of Return Of Service Obligation, to pay back the move. That might not preclude you attempting selection, SASR regularly takes tri service candidates, but the RAAF might be a bit shitty about not getting their moneys worth and try pointing you at 4 Squadron, B Flight Combat Controllers, they do the Commando selection and reo cycle and work with SOCOMD.
Our SOF is reasonably limited, SASR, 2 Commando, Special Operations Engineer Regiment, the two Sig squadrons that support SASR and 2 Commando, 4 Squadron RAAF, away from SOCOMD there is the RAN Clearance Divers, and in the Reserves, 1 Commando and the Sig squadron that supports them. That's about it.
Generally unless you're beret qualified, you're in and out on the posting cycles, so the only way to stay in is to complete selection and reo, not much in the way for an enabler to hang around.