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Personally I would put some of the blades of grass on one layer and others on another layer, then I would generate an animated fractal noise layer to act as a displacement map for each of these two layers. You will have to pre-compose the fractal noise layer to make it work as a displacement map.
You could also use any one of several distortion effects on two or 3 layers of grass so you're animating a bunch of blades of grass at the same time with just a little bit of work. Trying to animate a couple hundred blades of grass on individual layers is going to take forever and probably won't look that good when you're done.
If you have no idea what I am talking about then use the Search Help field at the top right corner of AE to look up displacement map, fractal noise, and distortion effects and do some studying.
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Don't bother with laying out the grass in AI. Simply create a bunch of prototypical stalks, animate them in AE in a pre-comp and then re-use those pre-comps with different timings and random time-remapping.
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