I just finished my quick tests minutes ago.
Yes, CC4 Exports BVH for DAZ just fine. The export settings are the same as with 3DX:
Hip as Root bone and Reset Bone Offset must be checked.
Just have your character in CC4 as Humanoid with original DAZ skeleton.
All bone from BVH are properly retargeted in DAZ studio (Limits must be set OFF for all bones in DAZ).
The only problem is UpperArm bone. It has some weird offset.