Sim time is never flight time, so the time you are working as a seat filler in a level D sim can not be used towards the flight time requirement.

However, the level D sim time can be used for currency, i.e., landings, instrument, etc...along with the training time towards your type rating if they decide to type you at 400 hours.

Currency time must always be logged that way, and again, even though you may be getting current for landings, instruments, etc., it is again not flight time.

Better off finding flying time.

Just my two cents.