You can download KML files from this page for your GPS. As you can see on the map, every section has a unique name, e.g. 'VF4'. Original and alternative routes have different colour and name codes.

Original route: orange; name VFx (where x is the number of the section)

Alternatve route: blue; name: VFxA (where x is the number of the section)

The files can be downloaded as a single KML file, or as a ZIP archive. In the ZIP files you will find separate KML files for each section. For the sections, consult the route map.

leg single KML file one KML file for each section, in ZIP archive
England KML ZIP  
France KML ZIP  
Switzerland KML ZIP