Can't comment on A320 confusers, but someone has brought out a Flight Sim add-in for A320 - it might save you having to build it, if CRM is tha main part of your study, as opposed to building a sim.
I do think that it is difficult to study CRM effectively and realistically in anything less than a "proper" sim though - even in a "proper" sim, there's quite a bit of shorfall in comparison to using the actual aircraft (for a start, everyone know emergencies are simulated). Of course it would be a rather expensive exercise to study pilot interaction/CRM in a motion sim (or even in a fixed base "proper" sim).
Also remember that the very presence of observer(s) can skew the individual's behaviour quite substantially (so-called Hawthorn effects)...