Hi @jaypear,
It sounds like what you need is our globe anchors feature, which enables you to place prims at a certain latitude/longitude. Then when you update the CesiumGeoreference, those prims will remain anchored to the same location on earth.
This feature is in progress, and we should expect to see it in the 0.10.0 or 0.11.0 release. A similar feature request can be found here.