@blackbonner 

Thank you!  I just made the hair in Blender using the hair particle system which I converted to their new hair curves system. In Blender 3.5 they have the new hair assets so used the shrinkwrap curves to get the look I was after. After I was happy I just converted the curves into actual geometry and imported it into Poser and rendered using the PrincipledHair bsdf shader. It was actual hair strands with over 1mil polygons and surprisingly Poser handled it really well.

I am really hoping one day someone could make a addon for Poser so we could import blender curves as Poser hair. That would make life so much easier.