WR,
As I understand it the validation is based on the medical and licence you have when the checking process is done.
If that is what it says on the tin then I think the options are:
1. Get and FAA medical as they suggest or
2. Get a new CAA/JAR medical and go through the revalidation hoops once more.
IF you want to know whether a new CAA/JAR medical is valid without going through the revalidation process once more you best ring the FAA.
For things that are as important as knowing whether your licence/medical is valid you want to hear it from the horse's mouth, not some well meaning forum interpretors of the FARs.
FD
FAA AME