I presume that at the time of the revalidation the ME CR was valid. If not, then the IR revalidation wouldn't be valid as you wouldn't have been authorised to fly as PIC at the time (although it would be recorded as PICUS or P1S, whichever you prefer).
However, assuming that you DID hold a current ME CR at the time of the revalidation then why didn't you include the Class Rating revalidation during the same IR revalidation flight, which would see to make economical sense?
As regards CV, it is probably better to list Ratings separately with their effective dates, thereby showing the propspective employer your currency so the short answer is 'Yes, it would be better to revalidate your ME CR first', otherwise you would be listing IR, effective yada yada, ME CR, 'lapsed on yada yada'.