@ BOAC : Thanks, that's really the tack I've been taking. The little input I have received directly has basically been the chance of any one pilot experiencing more than one engine stall in a career is low and that each stall occurrence will likely be quite different (single-bang, repeating, etc), such that doing much more than ensuring the volume/direction of the cue sound is appropriate would be a waste of time.
However, I am always looking for aspects that I can improve, so this seemed a reasonable opportunity. I am still wondering whether certain engine types are more likely to generate a specific sound cue, versus other engine fitments (CFM vs IAE on the 320 for example), but again, I may be barking up the wrong tree.