I have been pursuing creating PBR SSS skin shader for Poser quite recently using cycles as my root. Relying on Blender as a guide, I came across a couple of youtube tutorials which may shed some light on how to assemble such nodes. I hope that the links may help.

https://www.youtube.com/watch?v=M_kl5UgPIhE&t=1796s

https://www.youtube.com/watch?v=48Ag0zLL9zA

Unfortunately, there is some node work which is impossible in the current version of Poser. It would be nice to see improvements in those areas. My understanding of noise using SSS. that should clear up if you use higher render samples which will definitely increase render time. No way around it ATM. As for roughness, that is not exclusive to metals. It is applicable to dielectric material and skin as well. I wouldn't shy away from testing it with character textures.