Just don’t scale in the exporter. Use scale = 1.0 in the exporter and scale the model in Unreal Scene, use Blender default unity as cm or blender world scale to Metric and change to 0.01 but don’t scale in the exporter.
I need to dig it further but look that the best metric workflow is set Metric to 0.01 and always keep scale 1.0 in exporter