I want only to revalidate my SE-IFR-Rating, not the SE Classrating, I know that in this case one must fly in an real airplane.
I don't understand this. If you don't renew your single engine class rating, renewing your SE-SPA-IR then becomes useless, as you can't fly the plane anyway. However, I think that the flight test to renew your IR may well count as renewing your SE class rating anyway.
I can't think of any single engine FNPTII sims; you may have to renew a SE-SPA-IR on the real aircraft.
and hourbuilder beat me to writing the rest..........