Dude that’s awesome! Kinda got chills from it. I don’t think there’s any canon source that states it was broadcast but it works as a strong headcanon that doesn’t contradict anything.
I think it might work better to start showing it as a broadcast before any of the reactions like at Canto Bight are shown, otherwise it’s a bit unclear what’s happening. And I like the idea of the cut-off at the end on his face, but the cuts between different angles make it feel more like a spy movie than Star Wars, so I’m not sure if it would really fit into TROS like that. Are you going to try to implement it in the actual movie somehow, after the crawl maybe? I’m not sure where it could fit in well since I feel like it would need to be the first thing after the crawl but that may be an awkward transition since the crawl always pans down to a ship flying around a planet.
Also, what are you going for with the shot of Aftab Ackbar?