This sounds like a cool idea! I've got a notebook full of KH ideas, and this seems like a great outlet for sharing. I'll list a few.
Ancestral River - Pocahontas
Lavish Manor - Lady and the Tramp
Treasure Planet - Treasure Planet
Suncrest Fields - Tangled
Rhythmic Bayou - Princess and the Frog
And I've just got a quick question. I know you may groan at this, but are we allowed to use non-Disney worlds? I only ask this because I've been creating a knock-off KH game for my nephews using RPG Maker, and the worlds use other characters, since they are kinda older and Disney doesn't seem like their favorite thing (Spongebob, Mario, Skylanders, etc.)