0x384c0 uID

For motion vector to appear in renders do not forget to setup "Motion Blur" in Karma Render Properties [www.sidefx.com] and cache [www.sidefx.com] your animation.

The closest solution I implemented involved converting a KineFX rig and animation into agents.

After I was able to import character and its animation as separate USD layers, and use the Sublayer LOP node to apply the animation.
Sop import agent as "Create Instanced SkelRoots"

Sop import animation as "Create SkelAnimations"

In my case XPU renderer could not handle correctly UVs on model with N-Gons.
Try to use Polydoctor SOP [www.sidefx.com] or Divide SOP [www.sidefx.com] to fix your model.