In theory, very, very big IN THEORY, you should be able to slap the PBR skin shader on the geograft. From what I have seen in some limited capacity, the texture files themselves don't have a big difference over the usual uber shader.
After slapping on the shader, apply the futalicious diffuse, spec, normal, displacement, etc. normally (as well as the value settings) - and find the microdetail from the skinPBR shader that the character is using (if the character is using it).
However, you're probably not going to get super great results unless you fiddle around with some weight maps. In my experience the microdetails need a weight map attached or you'll have pores all over, and that will looks super fucking weird if the glans has a ton of tiny pores...
It's an interesting idea, I'm gonna have to give it a go at some point - but I don't think it's worth messing around before meipe actually makes the product compatible.