Can I do myself the CRM, dangerous good, ESET and find an examiner outside the company for the line and Opc check?
In theory no. But, there is always a "but!".
Training by outside source must fulfill the requirements set out in the companies (AOC holder) manuals. So the training must be of certain standards. However the training manager could possibly, after review, allow the courses. The OPC must be done by FE/TRE or qualified company pilot in accordance with the companies standards using this particular companies forms. You would also need introductory course into the company manuals, culture, forms etc which can hardly be done by outside source however the training manager could appoint someone inhouse to do the theoretical intro course with you.
It seems to me that you want to get a job with this company but they have limited time or resources to finish your courses. Itīs a well known problem for operators. Just keep at it and continue with the approval of the training manager or his deputy if heīs is busy.