Yes, Naboo, Coruscant, Bespin and Jakku are in the end sequence.
Not exactly in regards to Ascendant, but I think it would be cool if there was a montage where we saw different planets hear Poe and Finn’s rallying call. Like maybe we could see the Falcon flying in hyperspace, hear Finn and Poe’s speech but with some radio/recorded distortion, and then cutting to establishing shots of different planets or something. Though I think it is difficult to try and reuse shots from other films/shows without it feeling too fanedit-y.
At the very least, I think it would be cool if when we saw the Falcon take off and fly away from the base, we also heard a bit of their speech with some audio recording distortion that fades off as the Falcon flies away, making it clear that it was POE (and Finn) and their rallying call that brought the galaxy together, not just “Lando”.
That would be really awesome and interesting idea! The shots of the Resistance preparing their vehicles could be replaced with the planet shots, but it would take work to make them look different than previous material. Maybe have someone render them in Unreal Engine or something like that and do wide shots instead of close ups? Some animations can look almost 100% realistic if done well and with the camera at a distance.