If we look at AHRS orginal question another way.
Are you just looking at a way of not doing base training in the actual aircraft and therefore not really concerned as to the finer points of simulator levels.
If so basic requirements for ZFT;
A pilot undertaking ZFTT course shall have completed.........on an aeroplane having a MTOM of not less than 10 tonnes or an approved passenger seating configaration of more than 19 passengers.
(a)1500 hours flight time or 250 route sectors if a flight simulator qualified to level CG or interim C if used during the course; or
(b)500 hours of flight time or 100 route sectors if a flight simulator qualified to level DG , interim D or D is used during the course
and the Operator must have JAR OPs approval for ZFT course etc etc etc.