Actually - one more thing:
Has anyone tried to do anything with the “import=yes” tag that’s been added to e.g. https://www.openstreetmap.org/way/556830183 etc.? I don’t know whether people in Thailand mostly use web-based (OSM Carto or similar) maps, or Garmins, or Osmand or something else, but in all cases it’s possible to change the map to some extent based on tags in the data. It would be possible to create for example an OSM Carto-style map that looked as normal but rendered “import=yes” ways in a different colour, or a different width, or as a lower class of road.
Let me know if there’s any help that anyone needs doing any of this.