By complete, I'm assuming you mean for the Protector title (as you don't need any starter island missions to complete Factions).
Minister Cho's Estate is a normal entry mission (available from party window), tho will pop up a warning saying you are from another campaign. You don't need any quests to do that mission (or Zen Daijun) as you are foreign and thus all outposts and missions are open to you.
Hope this helps.
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