I'm looking to do the exact same thing, a DipLang in French over only 3 years, starting at Entry Point 5!
Although there aren't (m)any French subjects that can be fast-tracked, there are definitely breadth subjects that can be and possibly some from your course itself (eg arts, commerce, science, biomed).
here is a useful list of those fast-track-able subjects:
http://arts.unimelb.edu.au/arts-student-centre/options/intensive-subjectsMy thinking is to choose my breadth subjects for second and third year, where i'll be taking 5 subjects per semester, mostly from this list, and look to fast-track them over the holidays. That way it won't be necessary to overload throughout the actual semester.
edit: noted that there is only one French subject, a Level 2 or 3 called 'In the Heart of the Loire Valley' (
https://handbook.unimelb.edu.au/view/current/FREN20020) that is permitted for Entry Point 5 which can be fast-tracked.
It literally takes place in the Loire Valley, in France. ha