It seems like all roads are leading to Young Avengers--or some iteration of it. This could be a film franchise, or a multi-season Disney + series. Having just reread Heinberg & Cheung's run & Children's Crusade, I'd love for the MCU to use that story thread as a road map.
There are some deviations that will be necessary, of course. For example, I'd substitute Jessica Jones for Scott Pym in this story. And maybe make Hulking the son of a different Kree (in the comics it was original Captain Mar-vel & his mother is Skrull). You would need to also alter Kate Bishop's introduction to the team given her origin will be played out in Hawkeye.
All that being said, there's great character in those stories and it does a great job of working as a standalone that still hinges on the larger web of the MCU. Who better to the plot the course than the original creator himself, Allan Heinberg?
Young Avengers
adapted for the screen by Allan Heinberg
heroes.
Iron Lad / Vision: Asa Butterfield, 22
Hawkeye: Hailee Steinfeld, 21
Patriot: Jharrel Jerome, 22
Wiccan: Fionn Whitehead, 22
Hulkling: Skyler Gisondo, 23
Stature: Emma Fuhrmann, 18
villain.
Kang: Andrew Scott, 42
avengers.
Ant-Man: Paul Rudd, 50
Wasp: Evangeline Lily, 40
Captain America: Anthony Mackie, 41
Captain Marvel: Brie Larson, 30
Dr. Strange: Benedict Cumberbatch, 43
allies.
Agatha Harkness: Octavia Spencer, 47
characters for sequels:
heroes.
Speed: Nicholas Hamilton, 19
Ms. Marvel: Saara Chaudry, 15
Spider-Man: Caleb McLaughlin, 18
villains.
Kl’rt: Aldis Hodge, 32
Yon-Rogg: Jude Law, 46
Mephisto: Antonio Banderas, 59