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Touring in the Ardeche
Depending on what accommodation you are interested in I have found this site very useful.
https://en.francevelotourisme.com/cycle-route
We did a two week tour a couple of years ago, and went to the Vercours too. Absolutely fabulous, though you need to enjoy hills, which are long though not steep.
Day by day routes on cycle.travel - I think this is public access
https://cycle.travel/by/brian_fox/journeys?group=10706