I realize this is an old post, but I have been pulling solutions from these forums for a while now and thought this might be a solution other people would wanna know about.
In order to taper or shape a CC Cylinder into a cone without a pluggin (and additional cost), you can Precomp the contents of the cylinder and add a warp effect. Depending on how detailed you need the taper you might have to keyframe the mesh or warp effect to get the desired result.
I didn’t see this solution anywhere else online, so hopefully that helps, it seems to work great for bottle labels and also textured sports balls from flat labels (with CC Sphere).
Again I hope this helps, Thanks for everything else!