Others have been working on an alternate method and have been able to get G3F into Poser. However, you will still need DAZStudion installed to help with this transition, and once either G3F or G3M is imported into Poser, all facial expressions and morphs are non-functional. These are separate riggings that Poser cannot import. There are other issues, as well. The effort is not worth the conversion.

BTW, G3 base is freely available with the installation of DAZStudio 4.8 or 4.9 Beta. If you are willing to learn another system, then go for it.