HV Alphas

[exit6]

I have this scene with an airplane flying over a wildfire, and the plane passes through some HV smoke. Since HV's take so long to render I can't put the same level of anti-aliasing and motion blur on them, so I render the layers seperately and put them together in After Effects. Is there a way to allow the HV's to effect the plane's alpha channel, or vice versa, so it looks like the plane is passing through the smoke I don't know if I'm making myself clear... Any help would be great! Thanks --