My suggestion would be to either focus the plot on Maul or Mandalore. I made an edit based around Maul in TCW (pre-Season 7), and it only included the Mandalore episodes when absolutely necessary. There was a 10 minute trim of Voyage of Temptation just to establish Obi-Wan and Satine’s relationship, but the rest of the first half was all Maul and Savage episodes.
So my suggestion is either focus it on Maul and Dathomir, only bringing in Mandalore and Death Watch when they are relevant, or focus it on Mandalore and have Maul only show up around when Death Watch finds him.
That makes sense. Since my focus here is Mandalore, if we cut down Maul’s arc the new list would be
Star Wars The Clone Wars S02E12 - The Mandalore Plot
Star Wars The Clone Wars S02E13 - Voyage of Temptation -> trim down
Star Wars The Clone Wars S02E14 - Duchess of Mandalore
Star Wars The Clone Wars S03E12 - Nightsisters
Star Wars The Clone Wars S03E13 - Monster
Star Wars The Clone Wars S03E14 - Witches of the Mist
Star Wars The Clone Wars S03E05 - Corruption
Star Wars The Clone Wars S03E06 - The Academy
Star Wars The Clone Wars S04E14 - A Friend in Need
Star Wars The Clone Wars S04E19 - Massacre
Star Wars The Clone Wars S04E21 - Brothers
Star Wars The Clone Wars S04E22 - Revenge
Star Wars The Clone Wars S05E01 - Revival
Star Wars The Clone Wars S05E14 - Eminence
Star Wars The Clone Wars S05E15 - Shades of Reason
Star Wars The Clone Wars S05E16 - The Lawless
Now with 9 episodes left, the total runtime become approximately 3 hours (~20 min per episode) which is a reasonably length for a supercut. I’m also thinking how to incorporate smoothly “A Friend in Need”. Lux Bonteri was only first introduced in “Heroes on Both Sides”. Do you think I need to include that episode?