This AI 3d project seems to be aiming for that, applying animation to a fbx figure based on video/image samples .  https://plask.ai/  

However while many of the objectives you describe like text UI administration of Poser (Py script)  can already and has been done WITHOUT AI, the reliance of an AI webservice to the Poser software application will be a costly dependency and likely convert the use license to subscription or pay per use. Because it woudl so fundamentally change the direction and technical resources behind the development of Poser,  IMO it woudl make more sense for Bondware to license out the Poser API to a 3D AI art front end if the technology required it. 

I tried some of the suggested tools, that masterpieceX output is not render worthy... not close.  Maybe background characters for some amature low poly retro game, but not art quality renders,  Seems like embracing AI at the moment would be be foolhardy and reactionary to the hype and buzz... Poser is not NVIDIA.  I do not think Poser NEEDS AI integration to succeed... perhaps the depreciated FUSION capability could be replaces with OpenUSD & Omniverse support.  That would enable more than just AI in the pipeline.