Fixing Attune for Star Wars
Brainstorming:
Attune works for Blades, as "messing with ghosts" isn't as comprehensively useful as the Force. With the Force being both augmentation of mundane actions and adding pure-magic actions, an Attune-focused build smells unbalanced.
Also, Blades' 12 actions is pretty critical to saving throws, so having non-force wielders forced to take it anyway or impair their maximum saving throw is disturbing.
Possible Star Wars-Flavored Solution:
Redefine Attune as Force/Luck/Intuition:
Non-sensitives can be lucky, or intuitive, so it's no longer an awkward dead spot.
Force users are just aware that these are all words for the same thing.
See also Blades / Scum action Defs for definitions. (For example, intimidate is Command, not Sway, which I have gotten confused about.)