Hasta La Motion!

I looked around for solution to this and I didn’t see one, so if this was asked before,I didn’t see it, sorry.

I need to attach 3D wings to the back of actress, she moves around in the shot quite a bit, and the wings are normally behind her relative to the camera.

Using Syntheyes how would best do this?
My current though was to tape dowel rods to her back with markers on them. I am thinking there must be an easier way.

If it matters… I am using Lightwave 9 to model the wings and render them, Syntheyes to track, and after effects / premiere for the final product.

thanks for any help.

— Xil