Nick,
Look at this from an objective standpoint and play Harry the Bast**d in a strict devil's advocate manner.
Try to find a reason why these lenses should not be allowed in the cockpit environment, thinking of how they may interact with existing colours in daylight and at night, both inside (PFDs, Caution / Warning lights, Maps) and outside the cockpit (Runway and Approach lighting, PAPI / VASI, aircraft lighting).
Once you've identified a reason you've answered your question. The CAA will bend over backwards to try and find such a reason.
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