I was actually thinking of something a bit like this after staring in amused second hand embarrassment and horror at the absolute pile of shit they came up with.
First off, get a new actress; the bitch they have now killed Bond and is very unlikeable in the Brie Larson kind of way. Have new actress be Mutt's wife, maybe still be related to Brody. Mutt still dies in 'nam, but it's because he was killed during a mission to save a legendary artifact from planned napalm strikes at an old Funanese temple in the Ho Chi Minh trail. She finds out about it during an expedition in the Sudan or something, and essentially gets put on break and goes back to the states.
Indy became the Dean of Academics for his college and is a Professor Emeritus, having retired from active expeditions and classes just a few years ago after a hip accident in the Cloud Rainforests of Ecuador. He also is watching over his grandkid when He finds out about his son's fate. Indy properly retires to the home and only comes out when the new lady comes home. The two together resolve to finish what Mutt started, and to do so must contact his partner, which allows you to bring back Short Round. Indy in the film is now how Sean Connery was; a silver fox, but not the physical actor due to his age. It is Indy's last ride, as he and his daughter in law, and adoptive chinese son come to terms with Mutt's passing and try to recover the lost Funanese artifact and aid suffering villagers in the aftermath of the napalm bombings.
Indy dies saving them at the end from the villain also seeking the artifact, and the lady and Short Round both find closure in it, and place the monument in a museum. The film ends with a memorial to Indy being made and the new Dean speaking about his life.
Only problem is this gives Indy a dignified death and legacy and fuck that lol.