Using Syntheyes distortion maps in Fusion to composite 3D from Blender?

After solving for lens distortion in Syntheyes I've got the option to generate distortion maps which, as far as I can tell, are pretty standard.

The current workflow is to track in Syntheyes, undistort the image, bring that into Blender where I add some stuff in 3D and then render that all out.

Now I'd like to composite those rendered layers over the original, distorted footage but I'm having trouble using the distortion maps generated by Syntheyes to distort the 3D layers to match the original footage.

I've also looked into trying to use those maps in Blender to distort the render directly but not having much luck there either.

Didn't find much when looking through the fusion manual or online so was hoping to get a little help if anyone has tried this before!