On the anime front, you can also see the Z-Fighters in the outside-of-continuity story known as Super Dragon Ball Heroes which has taken the opportunity to bring back heroes and villains from the series' past.

Source: https://comicbook.com/anime/news/dragon-ball-fortnite-fans-future-characters-debate/

Since each one of the strongest Z-Fighters are now getting unique transformations, it would suit the narrative very well to have the same done for the Universe 6 Saiyans.

Source: https://gamerant.com/dragon-ball-super-could-bring-universe-6-saiyans-back-in-a-big-way/