You cannot do a TR with a PPL at least in EASA system.
Could you please advise me of the JAR reference for this. It may be a locally enforced requirement of your own authority, but my understanding of JAR-FCL 1.250 is that the prerequisite requirements for a multi pilot TR are 70hrs PIC, an instrument rating, Multi-engine rating, MCC and completed ATPL theoretical knowledge exams (1.250 states you should have met the requirements of 1.285 which is ATPL theoretical knowledge requriements for the ATPL).
All this from memory (so please don't lynch me if I misquoted anything), damn I need to get out more!!!
RIX