I am importing 3D dgn elements to ConceptStation, and then exporting to LumenRT for photo/video editing and rendering. In my dgn/3D model, I am stenciling the striping onto the 3D surfaces/models and then importing the dgns to ConceptStation. They show up ok in ConceptStation, but when exporting to LumenRT, the striping elements do not show up or seem to export.
You should be able to export to LumenRT from the DGN and not from ConceptStation. Your striping step would be done just prior to export to LumenRT. If you need content from CS, import into Microstation dgn, then out to LumenRT.
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