Don’t know if you’re using C7.2 Pro, but you can select the model under the figure’s hierarchy and then select the wrench icon above. This will open the model in the Vertex Modeler. From there, go to the Selection menu and Select by Shading Domain. Find the domain for the helpers and choose that. The helpers should now be highlighted red by default.
Now go the View menu and choose, Hide Selected. The handles will now be hidden in your render. This really only works well with rigged DAZ and Poser models for some reason. If you were to do this on your own model or a non-rigged model, the hidden parts would be visible in the Assembly room and in renders.
The advantages to this method are that some effects don’t play nice with alphas. Also, even though you may have an alpha applied, the geometry is still being calculated for light interactions.
I can’t post screen caps at the moment as I’m rendering something, but if you need them, I can try and post them later tonight or tomorrow.