In order to get the UVs to match properly I would probably need to borrow the actual mesh and I do not have permission to redistribute it. However, it should not be hard for you to export the mesh and rig it yourself, then make a subclass of the LookAlive component that drives the dilation of the pupil in the material instance from the dilation parameter of the component.
I think the current version (marketplace is one version behind current) of the animation blueprint emulates saccades quite well. The eyes will pop without blending to its focus and then smoothly track it in the focused state while in the wandering state they move smoothly.