I think, in this case, it is logical that certain members of official factions (e.g. new ones) should be wearing indie IDs, because Official Faction ID counts as SRP ID. But, that's to be left for Green Headmasters.
Take into account that Official Faction ID and Indie ID may have way different lines which should not be allowed for e.g. newly recruited members - given only when they have more experience, but that's only my point of view being a slight suggestion.