Although much more limiting than Kingdom Hearts 0.2, custom scripts are possible with custom maps in KH3, though you need to use triggers instead of direct inputs to get stuff to work... for now.
Thankfully, 13th Vessel gave me a good tip for getting it to read Sora's character.
At present, Luseu has 299,241 views spread across 37 videos for Kingdom Hearts III, and about 2 hours worth of Kingdom Hearts III videos were uploaded to his channel. This makes up 29.62% of the content that Luseu has uploaded to YouTube.