I can see why C2 is the 'easy' choice and maybe even the right one, but I find the discussion of why has been interesting - I always prefer to think things through rather than fill by rote, or because everyone else does it without knowing why.
The absence of a RCD where not needed to meet minimum Zs requirements doesn't seem to pose a 'potential immediate danger if a fault develops'.
However, if any device is potentially faulty in one aspect, can it be considered safe in other aspects.
Changing it is not really the issue for me, it's whether using C2 as a way to 'force' something to be changed that may not be dangerous is a valid use of the EICR (it may well be just to be sure)
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You know, you now have me doubting myself. The RCD you linked to doesn't have clear L or N markings on so my one is likely the same. If it was wired reverse to how it was designed, would it trip under a meter test, but not by the button?