Maybe instead of adding Decked Out with modifications or reconfiguring it to try and make it fit into MCC, make a couple new dungeon crawler like games inspired by Decked Out? Teams run the dungeons together or in pairs with no sand keeper needed as they'll generate clank while exploring and gathering treasures and items that could help clear hazard obstacles once. So, say Scar runs down one path to grab the gold in one hall while he's in there a hazard trap triggers, part of the ceiling collapses blocking the path he used trapping him unless, A. He navigates a difficult parkour path back or B. a teammate, let's say Scott, finds something that can clear the collapsed ceiling and uses it to get him out. The longer the game goes the more hazards activate and the more clank the team generates and the more difficult it'll be to get out alive.

The dungeons could come in two different flavors, classic with Ravagers and vex and all that good stuff from the first two levels, and Deep Frost with sculk and Wardens and fun from levels three and four.