A set of pads would last me 2 or 3 weeks at least, anywhere in the Alps, though I havent ridden in bad weather there much.
Never bothered with dual ply either, 2.4 High Rollers and normal tubes were fine – but I’m only 11st or so in gear.
You can get too worried about spares, but if you are driving, you may as well err on the side of caution. Whatever company you are riding with will havve some of the stuff you need, plus there are bike shops in France too… It’s just as important to make sure your bike is in good nick before you go, to avoid wasting everyone’s time when you arrive and 10 minutes into the first decent.
If you take a dropper post, and it’s fairly new, maybe take a regular post as a back up too (especially if you have a Joplin 4!). I usually take a spare BB on trips, that fits both our bikes.
I’d assume you always carry one spare set of pads and a mech hanger?
Do the other guests a favour and take plenty of jerseys 😉
And if you’ve got room for some cider, then all the better!
You’ll have a brilliant time, go an enjoy yourself!!