My opinion..RT et al ref northern France is correct.
Your route looks great...Verdon Gorges has some great roads and views( I was there a couple of weekends ago)
The good thing about the Pyrenees is that it's not packed full of tourists/camping cars etc the way the Alpes are so you can cruise along nicely.
Cirque de Gavernie on your map...I'd try for Cirque de Troumouse instead. Well worth the ride up past the restaurant on your left hand side when riding up ....park at the top car park and dander off for a picnic. (Some people think that when they get to the restaurant that that's it)
Very scenic,although it's a dead end road, and you'll pay a couple of euros to get to it. A great ride that not too many think or know about.