I personally don't see it happening as a world based on the fact that there are more major Disney properties that have yet to be included in KH, and while there are certainly some slightly more obscure ones out there, I feel like we have yet to tap into some of the greater properties/films that Disney owns. We've yet to get a Pixar movie included in KH, so honestly I think seeing something from a TV show, which is far more niche and has a younger target audience than Kingdom Hearts does as a whole, is highly unlikely.
I'm not saying I'm opposed to the whole concept, as I respect you making a thread dedicated to your idea, it's awesome. I just personally don't find that it makes much sense considering what would be left out in order to include this.