NOTE: I am no longer using this plater mod since I feel it messes too much with custom npc colors in m+.
Instead I am using a plater mod that simply colors the BTE target lightgreen:
And a blade flurry range check weak aura that puts a BF icon on enemy nameplates in range of your blade flurry, when blade flurry is active:
Colors the nameplate of targets with your Between the Eyes debuff light green.
Colors enemy nameplates in range of your Blade Flurry light blue (in combat only).
Overrides to aggro color if you get aggro.