Hi karam2fly
You mentioned that you need an extra 125 pic Hours to get your atpl in oz.
the easiest way you can do this is to simply upgrade you current type rating from Copilot to Command. all that is required is a few sim sessions.
after doing this, make sure your australian Command instrument rating is valid and that will allow you to log ICUS on the current aircraft that you are flying.
I Reckon thats your best option in the long run because you will have an unrestricted Aircraft Endorsement and you will not need to take a break from your paying job to do 125 Hours in a C152.
check out Appendix III of CAO 40.1.0 for the CASA requirements regarding what you need to do in the Sim in order to unrestrict your Aircraft Endorsement
Cheers