I made a final try at a possible free workflow. The U.S. government offers a free Java-driven image tool ImageJ, intended for scientists and doctors needing to build vast image stacks. Importing a render stack is very easy. Being in such wide use, ImageJ also has many free plugins. There's one free PSD stack exporter plugin. But even with this, and all the other plugins, ImageJ still cannot write out its imported stack to a layered PSD. It can only save the stack out as individual PSD layer files, or as a PSD with one flattened layer.

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Learn the Secrets of Poser 11 and Line-art Filters.