If it were me I would use the V4 DEV version keep the hip, abdomen, chest, neck and head and delete the rest. Save as "MyNewModel.cr2"

Import your hair model and enter the set up room.

Double click on the "MyNewModel" thumbnail in the library to add the rigging to the model.

Add extra bones for the tails ensuring that I name the bones to match the group names in the model.

Return to the pose room.

Ensure that the head is selected then run this script to reset the head end point.
Look in the V4 DEV cr2 for the required values of x,y and z.

import poser
scene = poser.Scene()
actor = scene.CurrentActor()
x = 0.000 # type in end point X coord here
y = 0.000 # type in end point Y coord here
z = 0.000 # type in end point Z coord here
actor.SetEndPoint(x, y, z)
print "%s end point set to %f, %f, %f" % (actor.Name(),x,y,z)

Save to the library.