I had an idea for a custom battle series where the bardock of future trunk’s timeline survived and comes to earth searching for Goku after hearing of his battle against frieza. When he gets to earth, he meets trunks and finds out that all the z warriors and Goku are dead after the events surrounding the androids. Trunks tells Bardock about the super dragon balls (cause this would be shortly after the Goku black saga hypothetically) and Bardock and Trunks team up to try to see if they can find them toresurrect the fallen z fighters, goku, and the sayian homeworld: planet vegeta.
Cooler, Chilled, and Broly (Z movie Broly) would probably be the main antagonists of this arc, as they want to use the dragon balls to bring frieza back and take control of earth.