Yeah my two cents go for either Corellia or Naboo.

I like Corellia because it’s the closest way to acknowledge a EU planet. And Naboo because it seems the idea of retconning Ajan Kloss to be Naboo has fallen by the wayside, and there’s that pretty good Theed Palace night shot that could serve, bringing more visual variety to the montage. As a small bonus for those who have prequel fan-edits as headcanon, the Naboo night scene where it comes from is cut in several fan-edits, so in a way it wouldn’t stick out as a reused shot 😄

And I agree Coruscant could serve as a nice treat for the boardroom scene (RogueLeader’s idea is worth trying). I don’t remember if the movie outright states that the First Order is politically controlling the galaxy (even if it’s the most evident outcome of TLJ). Having Coruscant at least would imply that being the case.