Heightened Perception, Roark Garnet, and Torkil Mux all affect when a target engages. "...Engage at initiative [X] instead of your (standard/normal) initiative."
Swarm Tactics affects a ship's initiative. "...that ship treats its initiative as equal to yours..."
Both happen at the start of the Engagement phase.
Question: What's the interaction between Torkil Mux and Swarm Tactics?
Example: If Torkil Mux has initiative and he uses his ability on Luke Skywalker to cause him to engage at Initiative 0, does it matter if Wedge then uses Swarm Tactics to raise Luke's initiative to 6, since he's now engaging at an initiative different than his own? It seems that RAW, Heightened Perception, Roark, and Torkil break the link between pilot initiative and when the pilot engages, so changing the initiative after Torkil does his thing should be irrelevant.