I qualified as an assessor and examiner some 7 years back and have done a few hundred assessments since then.
I am a fluent, native English speaker but I still found that it was a fairly (but not prohibitively) expensive and difficult course; the exam was an absolute b*****d!!
I can't see how it would add any credibility to your CV. All an employer is going to be interested in is the fact that you hold ICAO Level 6 and do not require retesting.
Saying that, I have come across several "Level 6's" over the years who had been assessed informally at L6 but who were not even L4 - one was no more than L2 and that was at a push. I accept that any assessment is a snapshot at the time and small assessment deviations can occur but there should not be any more than one level of discrepancy, i.e. a L5 being assessed at L6, OK, but a L2/3 at L6 is having a laugh!.
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