Seeing that, it actually makes me wish that the team for universe 6 in the last arc had been all movie/gt villains. Since none of them are canon, it would have been a good way to introduce them into canon.

Have a team made up of Slug, Cooler, Broly, Bojack and Syn Shenron?

Sadly, that's not going to happen, because apparently only universe 6 has the same races as 7. So there are no Namekians or Saiyans in any of the other universes.