So here's the idea: if you're actively under the effect of a TM focus, change your spellcasting message to "You direct your [focus], awash in [aura], towards a bright green squirrel." in place of "You gesture towards a target."

And naturally people would see "Djordje directs his fateweaver's glass, awash in orange light, towards a bright green squirrel."

Just as a replacement for the gesture on spells affected by the focus.