Nature Tree Soft Occlusion replacement for wind and billboarding?

So I am creating a jungle scene (a lot of foliage etc.) and i need to have wind on my trees and plants etc. Right now I am using Soft Occlusion leaves for this case, but the Unity wind is giving my leaves a sort of staggering motion. And if i tweak the settings in my windzone, it either makes the leaves entirely still or makes it look like hurricane sandy just went over.

I have a custom shader that emulates wind on my leaves really well and it looks really nice (better then that of unity). The problem is that when I use this shader, I lose my billboarding which destroys the performance of my scene.....

So my question is if there's any alternatives to "Tree Soft Occlusion Leaves'', that still keeps the billboarding etc.

The wind is very important because without it my scene looks dead.... it's about 90% made out of plants, trees and grass.....