Can I suggest you contact Greendot Aviation in Bangkok.
Greendot-Aviation. Talk or email Veronica Zunic. They will design a Sim program for you that
conforms to CASA requirements. CASA has a good working relationship with this company.
My experience with them on the A330 Sim was near perfect in terms of training checking and compliant documentation. In my case they used the Bangkok Airways facility. My understanding is they have access to A320 Sims and Instructors.
Good luck