Good news! I have added WRLD3D to the Android TrackExplorer app. You can now switch the view between Mapbox and WRLD3D. It works “only” with the Android app. Unfortunately it is not possible in the web browser version - WRLD3D does not offer this possibility. Anyway, this is how it looks in TrackExplorer:

For further info read TrackExplorer OSM blog post