Just out of interest, why would you want to add the CRI to an FI rating?
Ideally I would like to do IR/ME, MEP and CPL instruction, hence I am interested in becoming a CRI (on a MEP) and an IRI. I have the required MEP and IFR hours, and have plenty of instructor time (mostly MEP and mostly IFR - though this is not in a JAA environment).
I am hence trying to work out whether I can instruct CPL/MEP/IR under JAR without first doing 100 hours and 25 solo supervisions of JAR PPL instruction. It seems that this is viable if I do a CRI and IRI course.