Go ahead and equip the shadow being with exact replicas. Just note that the replicas, just like the rest of the being, will dissolve away at the end of the plot.

As for shadow beings manifesting other items, feel free to do non-powered/normal objects that have story value. However, please stay away from powered/exceptional items (i.e., that would typically have to be noted in a character application) unless you get mod permission.

Does that answer your question? Let me know!