Anything that refers to Part-FCL, you can put a line through.
IN-2012/157 highlights restrictions that Part-FCL imposes on examiners. EASA has nothing to do with the IMC Rating as you could still put it on a National licence and they would be none the wiser.
The reference to the (notoriously incorrect) Standards Documents again refers to Part-FCL, subpart K in this case. Same reasoning as above, it is irrelevant in the case of the IMC.
You arn't looking for where it says you can test students you have trained, but rather where it says you can't, and neither of the above do this. The instructor already signs off one approach during the course, and this, arguably, wouldn't be allowed to happen under Part-FCL regulations.
The rules changed on 17th Sept when JAA licences were deemed to be EASA licences. UK licences remained National licences, as did the ratings.