This seems not to be so much about 'competency' but 'black letter law' and outrageous ego. The rules could be so very easily changed, no need to change the lamp lens. <5700 Kg SP/IFR competency demonstrated as per usual. >57 PIC/FO not with another CVD pilot, competency as per usual. A doddle with the right mind set.
Unknown - "Since the Denison ruling, CVD pilots have consistently demonstrated the ability necessary for the safe performance of duties through regular, rigorous flight and simulator assessments." (ICAO in bold).