If the new rules come into force (still in consultation) then that sim revalidation will be useless as you will be required to hold a current class or type rating to have it revalidated and hence, it will be cheaper to do a combined class and IR prof check.
My understanding of the cross credit was that the approaches were required to be flown in the class or type that you were not checking, rightly or wrongly. As it transpires I was unable to claim cross credit anyway as my SEP was revalidated by experience and not prof check hence was not accepted by the authority. I subsequently renewed the ME/IR.