Would you sign that person's licence in able to fly the C152 booked tomorrow ?
If I may be so bold to answer in Genghis' absence:
In the example you have quoted, the requirements have been met, so there's no reason not to sign the Licence for the revalidation of the SEP Class rating.
It matters not what that person is going to fly tomorrow, so long as it's included in the class rating you have revalidated.
MJ
