Jim,
Further to your last, I think what I could expect is a document confirming Eurocopter's statement that the aircraft, with the correct retrofit parts, fitted, complies with the Engine isolation requirements, and if flown according to the corresponding part of the Flight Manual Supplement fulfills the Cat A equivalence requirements.
Obviously as the parts are not fitted on the assembly line, no definitive certificate can be issued (as per the NP), but as for certain versions of the BO 105, which is in the same boat, some sort of compromise can be reached I am sure.
Biz-Buz