We use ISO currency code in our applications and it would be great if we could skip converting from your currency codes to the ISO Standard. I see that the NPCUR field seems to fill that purpose, but it seems to be available for Equities, although other types also have a PCUR.
From the data type definitions, NPCUR is ISO Currency Code For Datastream PCUR.
Therefore, it should be available when PCUR is available. However, to confirm it, please directly contact the DataStream support team via MyRefinitiv.