@Maiyannah Are you willing to take the plunge and try using Blender? The task you want done is simple when you use Blender with the Neverblender 2.8 plug-in. You can automatically generate the pwk you want. See this thread where @Symmetric helped me-
Blender: Is Someone Willing to Help?
Just import the model into Blender, add the pwk as described in that thread and export it again.
TR