This may be unoriginal but maybe it could be a good idea for spies and assasins to have male and female models?

Off the top of my head there were the poisoning trials of 331 BC, Sempronia sister of the Grachii was a top suspect in the assasination of Aemelianus, Cicero learned about the Cataline Conspiracy from a female informant, and during the civil war Appian records a lot of women hiding their husbands from proscription, including by disguising themselves, in order so the men they were with wouldn't be looked over.

Would it be possible for some of the agents to be female (recycling the Princess model) while the vast majority are males? The Romans don't make sense using the Princess because royal marriage simply wasn't how things were done in the Republic, it was very late in the Empire before marriage was used to cement an alliance for the first time, and that was well beyond the Europa Barborum timeline.