Thanks, @nobody002, and welcome to the forums!
If it helps for context, I was envisioning the scene to be similar to the dinner party scene in Dune, where as the party went on various dinner guests were unmasked as either Harkonnen agents or nascent allies of the Atreides. So, the scene above could be anything from PCs/NPCs sitting around a gaming table or one-off conversations as the natural drift of conversation happens over the course of an evening.
Given that the action we see in Dune stories are nuanced and the ruleset here is more narrative I feel like the answer has to be context based, i.e. driven entirely on the ‘fiction’ (to borrow a phrase). I’m probably stating the obvious but what I mean is that I likely need to pin down what I want (Are potential allies and enemies at the same table? If so, what exactly are they saying to each other and more importantly what are they trying to say or do with their comments.). I’m not saying you have to role-play this out as I think there’s plenty of room for a PC to say, “I want to understand if what the water-seller just said is a threat, etc.”
That said, it looks like it sets-up more as a series of contests, although, I’m not sure how you handle contests between two potential allies since the purpose of contests is to determine a winner - if both parties need to win, how do you ever imply something, e.g. does the Atreides agent need to beat a PC’s Understand+Truth to deliver a carefully worded message that he/she would understand? Or, does the PC need to beat the agent’s Communicate+Truth? I would assume you roll these against a set difficulty. Clearly, the Masterful Innuendo talent is your friend here but what if a PC or NPC doesn’t have that talent?
I could see moving this to Architect play and use that as a full Intrigue conflict but I was wanting to keep this at the PC level for the moment.