Here’s two ways to do this…if I understand what you’re asking.
1. Make all your layers, move your playhead and ctrl+shift+d or cmd+shift+d, this splits the layers, apply the expression to the new layers.
2. Tie the expression’s randomness or amount to a slider effect on a null layer. Then keyframe that slider from 0 to whatever.
– The Great Szalam
(The ‘Great’ stands for ‘Not So Great, in fact, Extremely Humble’)
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