The Face Room compatibility bears some considerable cost per figure for development and licensing, so it's something that would probably have to be coordinated between DAZ and eFrontier. It's beyond the budget of what the vast majority of Poser content creators can afford.

Another alternative is to use FaceGen, a product upon which the Poser face room is based and licensed from. It's not cheap, and in addition the custom morphs are not distributable. That probably won't matter for your project though. You can find that at www.facegen.com. There are a few folks that hang around these parts that use it.

The only other alternative is to use the built-in morphs that come with the Mil figures, and then learn to create your own custom morphs with magnets. But then you'll have to create the textures yourself.