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Yes, that looks okay. The roads in the Vercors, especially the climbs alongside the western side, are amazing feats of engineering and beautiful to ride.
On Lyon, can you get a TGV from the station at the airport back to Lille still? That cuts out the horrible last 10-15 kms through the Lyon hinterlands. As for a route, we did a route from Lac du Bourget that headed for Morestel then onto Cremieu then into Lyon (or the airport, depending on how people were getting home).
Like this?
Main factor was that non stop TGV to and from Lille but I am open to suggestions.