In reply to DaveHK:
Some suggestions for the first part of your trip, with the caveat that we normally travel in autumn/winter, so the areas will be much warmer, and probably busier, when you go.
Basque country within the Bilbao/San Sebastian/Pamplona triangle. Coastal scenery, green hills and a very different culture. Extauri is the 5-star crag but will prob be too hot, but there are plenty of shady options in the area too. We liked Camping Izarpe near Aroztegi but there are plenty to choose from.
Riglos is a must-see destination not far off your route. The faces of the towers face all directions so you may also be able to find shady climbing here. Van camping is tolerated in the parking area above the village.
In the Ordesa region itself, Las Devotas and Revilla are both quality crags, though I'm not sure what conditions are like in summer. We stayed at camping Boltana, but there are prob many more option in summer.
If you're not committed to Ordesa itself, an alternative to consider is Cavallers - loads of climbing and walking in a high altitude setting. Sadly there's no van camping high up, but there are plenty of campsites on your way up the valley.
Finally on to the Ariege. One of the best things about this area is you can pick your altitude to suit the conditions. Tarascon is great for spring and autumn, but in summer you may be more comfortable basing yourself somewhere higher, like Ax-les-Thermes.
We've travelled many times in these areas, so there's loads of info on Dom's blog. Try:
https://rockaroundtheworld.co.uk/category/spain/navarra-and-basque-country/
https://rockaroundtheworld.co.uk/category/spain/aragon/
https://rockaroundtheworld.co.uk/2023/03/16/cavallers/
https://rockaroundtheworld.co.uk/category/france/ariege/