Hi Lad,
I would say continue working hard as a casual and build more experience and hrs. Once you hit the 500hr mark then do your MECIR and ATPL subjects. Maybe by then your current work place would be favourable for your to take the leave needed.
Doing MECIR and ATPL subjects is no issue. It just needs $$$ and time. It's about placing yourself more competitive than your peers once your acquire them. As you mentioned " i want to progress into a full time position flying"