Therefore no requirement for the Examiner to be qualified on type either
Yes there is! The Examiner will be PIC during any Flight Test and must, therefore, be appropriately qualified.
the candidate can be P1,he is exercising his FAA qualification during the EASA conversion
No they cannot. EASA Single Pilot IR Test. Only one PIC allowed, and that will be the Examiner. In UK Candidate will be PUT if Test failed or PICUS if Test passed and Examiner agrees