The reason for the Lord Byron Cinema for MMRR is because Walt during his trip to Europe stumbled upon the theater which was showing Mickey Mouse & Silly Symphony cartoons.
https://disney.fandom.com/wiki/L%27Heure_Joyeuse_de_Mickey
Well there’s adding Mickey & Minnie’s Runaway Railway in WDSP with a replica of the Lord Bryon Cinema as the attraction‘s facade. Then there’s 20th Century Studios IPs that could in WDSP like Avatar, The Simpsons, etc.
I’m curious on how you’re going to have Mirror Disneyland do Disney 100 Years of Wonder along with MMRR, updated ToonTown, Pete meet & greet, and Wondrous Journeys?
Plus with Wondrous Journeys because Stargirl is in this alternate Disney history is the 54th Walt Disney Animation Studios film S.T.R.I.P.E.S & Courtney Whitmore aka Stargirl will be flying above the castle.