Unfortunately mate you have very limited options for OJT. OJT for each type needs to be approved by CASA. So from my understanding you have 2 options.
1) Your Company needs to get an OJT for 737 CL approved
2) Ask your training provider if they have an OJT for 737 CL approved.
If neither of these options work, then I'm afraid you will be unable to get licensed from your course. Currently it is a massive horses arse to get your first licence under the new system.