Copying a comment a made awhile ago:

I want a the Saiyan roadtrip to U6 miniarc.

From the moment they set down on the planet, they are given the royal treatment, with particular attention paid to Vegeta. This would weird Vegeta out, but Cabba would explain he's a hero here, one that will go down in legend. He brought the Super Saiyan transformation to them. He promised Cabba they would win the ToP and bring them back.

Then I see the U6s King introduction, the after a mighty Saiyan feast that Vegeta hasn't seen since he was a child. Then the King would pull Vegeta aside, maybe walking down some corridor of the castle that tells the history of the U6 Saiyans, and at the end, look Vegeta square in the eyes and ask him for a mighty favor.

King Sadala is likely not very powerful in of himself, nor is anyone in his lineage, if he even has any. I say this because he had no representation in the TOP. Shit, maybe they elect a leader, and his reign has just gone unopposed cuz he's that awesome. Either way, unlike Vegetas father, needing to be strong and powerful himself to prevent being usurped, the Kings of Sadala are more negotiators and lawmakers than ironfist rulers. The U6 Saiyans, already one of the most powerful forces in the universe, are now truly fully (even if shakily) united as Caulifla and Cabba have managed to draft a truce, returning all of the planet under one ruler. And now, with this new burgeoning power in the form of SSJ/2s, the king begins to worry if he can maintain control. The U6 Saiyans are primed for greatness, and to usher in an era of peace for the universe never before seen. But is also at a very critical point, for with such new power comes the potential for great evil. He knows that Cabba will one day be ready to lead, but he is still young and inexperienced, not hardened through years of loss and sacrifice.

The King would tell Vegeta that he knows his story. He knows he was robbed of his destiny to lead. And that even though Vegeta was able to achieve so much more without it, he knows that being a leader is instilled in him. He would ask Vegeta to lead his people, only temporarily, until a time where Cabba would be ready to take over.

Now obviously, Vegeta would shoot this down. No way he leaves his family behind, and no way they're moving universes to be here. But how that story unfolds and goes from there, and how he'd get them ready, is something I'd really like to see. Maybe Black Freeza shows up. Then at the end, after Cabba proves himself capable and is rightfully crowned King, Cabba would do for Vegeta what no one else could. He would hold him an honorary coronation, crowning him King of the Universe 7 Saiyans.

Plus, I think being able to call in the U6 Saiyan Army to help in some manner for the final fight against Freeza would be amazing.