Regarding Coco, wouldn't it be cool to set it as a prequel before the events of Coco? sure, that means that Miguel is not part of the cast, but it opens up the opportunity to explore the concepts of connections further. Sora, Donald and Goofy try their best to get Hector to be remembered but come to the realisation that they can't do the task because they are not the ones destined to do that.
Narratively speaking, we can have Nightmare Dream Eaters return as enemies as they are basically Kingdom Hearts Alebrijes, and have Donald and Goofy be Sora's Alebrijes/Spirit Dream Eaters whilst Sora is a skeleton.
Narratively speaking, we can have Nightmare Dream Eaters return as enemies as they are basically Kingdom Hearts Alebrijes, and have Donald and Goofy be Sora's Alebrijes/Spirit Dream Eaters whilst Sora is a skeleton.