@Avromal, kia ora from Porirua
You may care to be told there are three routes from Pontarlier (last town before Switzerland). All arrive at Bretonieres in Switzerland where the "official" route continues.
1) 62 km Pontarlier, Le Frambourg, Les Fourgs, then east/hill to Saint-Croix, Orbe, Bretonnieres
2) 43 km Pontarlier, Le Frambourg, Les Fourgs, south/hill to Jounge, then Ballaigues, Les Clees, Orbe, Bretonnieres
3) 35 km Pontarlier, Le Frambourg, south to Les Hopiteaux, Jounge, then Ballaigues, Les Clees, Bretonnieres
These can be seen on
hiking.WayMarkedTrails.org where you can also, for any route selected, see an elevation.
The authors of the Lightfoot Guide suggest either 2) or 3) better reflect Sigeric's route in 990.
You pays your money and takes your choice.
Kia kaha