I don't think it requires work at all. Magic already exists within the Star Wars universe. Our magic would just be seen as aspects of the force. Cure=force healing, Thunder = force judgment, Aero = Force Telekinesis. And I disagree that it doesn't fit the KH vibe. It fits it perfectly. The themes are similar and while it has its dark moments so does Pirates. If that and Tron could work in KH, Star Wars can.
Honestly outside of the Final Fantasy worlds the games already has I don't really see how to incorporate them into the story besides the Pit Stop. Especially in a way that'd push the story along. With FF being an extensive gaming franchise that would actually require a different RP.
But if the majority doesn't want Star Wars we won't do Star Wars.
To be fair, we could make this story a bit more on the mature side, if we wanted. All of our characters are in their late teens, early adulthood, after all. Just my two cents, though
As for incorporating more FF worlds, FFXV might be a good fit. With the main cast being only four characters, we won't have to juggle canon characters as much as other FF titles and the main theme of the bonds shared between friends could play pretty well into our character's/the characters that visit the world's own stories