we are there in a few weeks too, few days DH culminating with the PPDS.
last year we had biblical rains, ended up giving 50 donkers for a plastic boiler suit to ride in! so it might be worth packing one this time. be worth it if you dont have to use it!
my first time i was panicked in to taking loads of spare pads, tubes, hangers etc. but everything is readily available and never noticed that much of a price hike…
get a guide (dont pay for one) just see if you can tag along with a local or regular who can show you some of the off-piste stuff, especially under super-morzine & down to Montriond. puts you in good stead for next time!
pub tip: bec jaune brewery