Another good box set of a team (of sorts) would be the crew of Star Trek Enterprise: Trip Tucker, Hoshi Sato, T'Pol, Travis Mayweather, Malcom Reed and Phlox. We already got Archer in the Legacy line and so this box set would finish off the team. Could even include the extra parts to make all of them in EV suits from the series as all of them were at one time in an EV suit. And a bonus would be Porthos as a mini figure. This would be easy as most of the crew use the same uniform just different piping for their division. T'Pol could actually use a design form several other past figures, since she wore basic body suits, the white one could be a recycle of Emma Frost.
Another box set idea would be to finish off the Star Trek The Next Generation Crew: William Riker, Deanna Troi, Geordi LaForge, Worf, Guinan, and Data. We already have Captain Picard. This set could have the parts to make the Series Uniform and the Movie Uniform from First Contact and Nemesis. Also could include the parts to allow Troi to be made in a dress as she wore in the few few seasons of the show. Maybe a head swap to allow Troi to be Crusher or Pulaski. Maybe the parts to swap Data for Barclay or O'Brien.
Same would be true for Deep Space Nine as well. We already have Sisko. So a box set would have Kira, Jadzia/Ezri Dax (via head swap maybe extra shorter arms and legs since Ezri was shorter than Jadzia), Bashir, Quark, O'Brien, and Odo. If you do a box set for TNG and include O'Brien, then you could swap him for Kai Winn or Kai Opaka or even Morn.
Then we have Janeway and Seven of Nine from Voyager, so a box set would finish off that crew as well. Chakotay, Tom Paris, Harry Kim, Tuvok, Neelix and B'Elana Torres. Could include parts to swap and use Torres' body to make a Seska, and then parts to make Torres, Chakotay and Tuvok as members of the Maquis. and a rubber salamander to show the mutated futuristic version of Tom Paris.
Star Trek Strange New Worlds: Pike, Chang-Riley, Sam Kirk, Hemmer, M'Benga and Noonien-Sighn. That would be a good start to getting the new series launched in the Minimate Universe. The for Discovery: Burnham, Saru, Stamets, Detmer, Tilly and Linus. Need more aliens in the Star Trek Minimate Universe. Then could include parts to make other crew members of Discovery maybe or to make variations of the included characters.
Having the extra parts or such would encourage the collectors and customizers to purchase multiple sets and thus help both Diamond Select and the Minimates realm of collectors. All in My Humble Opinion.