For Germany: a Matterhorn-like roller coaster, renamed "Zugspitze"...
...or a Radiator Springs Racers rethemeing as a scenic, but hectic drive throughout the Autobahn network...
...or, a scenic, but simulated high speed rail journey throughout Germany. Model the vehicles after the country's ICE trains and get Deutsche Bahn as the sponsor.
For Italy: If the mountain coaster idea doesn't go elsewhere, use it here and use the Italian name for the Matterhorn, since part of the mountain also lies in Italy...
...or, a scenic gondola ride through Venice, or even along the Italian coast, including the Quinque Terre, the Almalfi Coast and the Isle of Capri...maybe even add Lago di Como...
...or, a light opera dinner theater.
For Morroco: Once again, if not used elsewhere, a Matterhorn-like coaster based in the Atlas mountains...
...or, Corsairs of the Mediterranean. It would give Florida a chance to use some of the tech from Shanghai.
For the UK: Jousting Dinner Theater!
...or, a brand-extension of Pirates of the Caribbean to the English coast (with Shanghai effects)...
...or, a brand extension of the Haunted Mansion into a Haunted Castle...
...or, a Robin Hood-based climbing forest.
For Japan: Kabuki dinner theater...
...or, a boat ride through feudal Japan, complete with a mock-samurai battle...
...or, an anime-based ride with similar technology to Mickey and Minnie's Runaway Railroad. Especially if Disney could use the IP from Studio Gibley.
The World's Fair concept that originally inspired Epcot is long dead, so I see no reason to try revive an idea that likely holds little appeal today for the general public. I had to look up to see that these events even still exist, although they go by different names and they're now mostly professional trade fairs.
But instead of just giving up and inserting dumbed-down, barely-relevant Disney IP, I think Disney can still dream up fun attractions that highlight the unique history and culture of each country.