Brett,
I hadn't given much thought to the correlation between location and the addition of copy clasps but that does make sense.
Most of the medals I see with copy clasps are where the recipient had no entitlement which meant there was no recourse to obtain the official versions of claaps.
That said, I have catalogues of few men of the LNLR who added the DoK (official) clasp despite there being no evidence as to their presence.
Best wishes
David