I would be mostly okay with Mary Poppins in UK.. there are worse fits.
Also, I'm pretty much 100% for Rat in France at this point. Good capacity, E-ticket, and of all IP choices Ratatouille has the most focus on the country it takes place in IMO.
If they put the Tokyo Beauty and the Beast ride, or anything BATB in France, that would the biggest blunder ever and prove how absolutely useless a lot of the Fantasyland Expansion was. Also, aside from "Bonjour" in the opening song and Lumiere, not much screams French culture about BATB. I guess it is much more French than Cinderella or Sleeping Beauty, but..
Plus Ratatouille would bring a balance so that not all of the IPs in WS are princesses. There aren't many non-princess IPs that fit into WS (that I could see Disney actually investing in).