Another thought I had was for Music Videos.
Similar to point 5. Renting Production Space in my last post, you'd need to hire a director, have them work with a choreographer (either one on your staff, or one hired based on reputation from other talent agencies), screenwriter if you want a storyline, special effects team, and post-production team to handle the video editing, and then book a Movie Studio set. This could then require us to select the theme, which would then affect costuming, special effects, choreography, etc. to match it (think BTS Mic Drop, Michael Jackson's Moonwalker, etc.)
You can decide is it just a straightforward music video of one of the singles that could release simultaneously, or is it where it's nearly a movie in its own right, just with a few of the groups songs carrying it through. Some of the idols could want to have lead roles, or have ideas on the script (a la point 1. Band Members With Production Skills).
Additionally, this could result in reaction videos of the music video, which would provide bonuses or penalties to popularity for the band and individual idols. Look at KDA Popstar, everyone was talking about Soyeon's rapping, Jaira Burn's free styling, etc. In a situation like that, could also lead to companies similar to Riot reaching out and asking to book the idol for a time to record in their own video.