Trek is the best operator I know of that does a trip for the Etape du Tour, a mass participation ride held annually that recreates an exact replica of a full Tour de France stage in the current year’s race, with thousands of enthusiasts attacking the course.
This year’s route included famous climbs in the heart of the Alps such as the Col de la Croix Fry and Col de la Colombière. Typically held on a rest day in the actual race, this “replica Tour,” is extremely popular, hard to get into, and usually picks a climbing focused stage. The easiest, most luxurious and most turnkey way to participate is on Trek Travel’s 6-day trip that warms up with local rides before tackling the race in day 5. This year’s was 105 miles with four notable climbs. The trip uses the highest level of fancy hotels in Trek’s scale and equips each participant with a pro-worthy Domane SL 7 carbon road bike with Di2 electronic shifting. The 2019 info will be announced here.