What about JAR-FCL 1.310(c)?
Interestingly this has been in JAR-FCL 1 since its inception. It has been further clarified in appendices added in later amendments. App 1 to JAR-FCL 1.340 lists credits towards the Teaching and Learning element of the FI(R)(A) Course but, only refers to credit for the holder of a FI(H) qualification. It makes no mention of the TRI CRI or IRI courses.
Wheras Appendices 1 to 1.365; 1 to 1.380; 2 to 1.380 and 1 to 1.395 all specify all the courses that qualify.
As the Teaching and Learing part of the FI Course is not treated as a stand alone core course but is heavily interleaved with the preflight briefings it is more difficult to credit a specific part of a course that really has only one part. It might be worth asking the question and quoting 1.310. towards an overall hours credit.