Reverse Engineering Layout Model back to SketchUp

I unknowingly deleted a layer that contained a laboriously created 2D model that I had exported into a window in Layout–which is now the only place it exists. Is there a way to either send the Layout model back to SU, or at least save it in Layout (if I update the model reference, it disappears)?

Yes. On LayOut, right click above the viewport and choose “Open with Sketchup”, then save your model in a folder