To put it another way -- if I were making a book cover for a client that required the rendering of a couple of historical outfits that were only available for Genesis 2, I'd have a few options: I could try to get someone to make me a custom set for Gen4 characters, I could try to kitbash my way into getting a close approximation, I could try to convert those outfits to work with Gen4 characters, I could try to render those outfits in Daz Studio, or I could use the DSON importer and just render those outfits on Genesis in Poser.

From a production standpoint, which of those options is actually the most cost and time efficient? 

It will vary from person to person, of course. For me, though, the last option is clearly the best.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.