The privileges of the JAA CRI rating are to train licence holders for the issue of a Class or Type rating. Therefore any flying training that could be classed as meeting that requirement including refreshing pilots who already hold the class or type could be included.
The AOPA course is an unofficial course and amounts to no more than teaching a pilot to use equipment fitted to that class of aeroplane therefore, you can teach it. You cannot count it as Instrument time as you would need to hold an IRI rating as well to do that.
JAR-FCL requires a pre-entry test for the FI course, it gives no credit to the holder of a CRI rating for anything other than 25 hours of teaching and learning.