For NQ there is no need for examiner at all as there is no exam, so what do you mean with it?
Beacause a CAA examiner is required to sign the paper work
AFAIK. I once asked a CAA examiner in the USA if he would sign my paperwork. "If you do 5 hours with one of my instructors" he said. Incidentally you can use FAA instructors, as long as the signature is a CAA examiner. If this information is wrong then I have been mislead by a CAA examiner in the USA in order to line his pockets with my money
I have tried converting my FAA Night hours to a JAA NQ but no joy, it really is a protectionist racket. Night is night, is night, is night......where ever you fly it.
If a CAA examiner is not required to sign, then I shall get my friendly JAA / FAA dual rated FI to sign it for me......