Have you tried Makehuman (http://makehumancommunity.org) or Manuel Bastioni Lab (http://www.manuelbastioni.com) these plugins are both free and Manuel Bastioni is fully integrated inside Blender, is really worth to check it out.
I had a similar issue importing FBX poses from Mixamo, the bones came all wrong, so what I did was:
1- import the pose without skin from mixamo into blender.
2- export that same pose as a BVH file from blender. (Can you export BVH from DAZ Studio?)
3- import a character from Makehuman into blender then apply the BVH to this character.
Hope it helps.