I mean even Klingons can wear Intel Outfit's, as there a Pre-Alliance standard duty outfit. But even Fed Aligned Jem should have an option, because both Romulan's regardless of Faction can wear Intel.
One could even say something similar for Section 31, after all, isn't the former Mirror Princess now a Member of 31? She wouldn't even be considered a true Ally of the Federation either. Yet that is more a (Feedback) type of discussion on Section 31 Uniforms. So why not a Jem who follows the former Constable, as it's likely just as fitting as the earlier example, or other less types like her who seems a lot more like Franklin Drake.
- - - UPDATE - - -
Some may agree or disagree on the 2nd (31) point; yet I certainly think Intel Uniforms should be unlocked. Since there's no reason why they shouldn't be, for that reason I'm calling the Intel Outfit a BUG.