Not sure about doing an MTF, but it would be cool as an option to do Madeleine north, descend one of the two La Chambre sides and then climb the other to finish at the Saint-François-Longchamp-1850 ski resort like in the 2009 Dauphiné.
Alternatively you could use those two parallel sides to make Saint-François-Longchamp a pass, and so have it as a climb in its own right climbing much of the southern sides but backing into La Toussuire, Croix de Fer or Glandon instead. It would be the junction which is 5km from the finish of these two ascents - leaving them both at ~14km at 8%, so essentially the same as Alpe d'Huez.
Going from Albertville, Aime or Bourg-Saint-Maurice (would be very cool to come after a La Plagne MTF, it's been a while, since 2002 in Le Tour, but the Dauphiné has been there recently) or even somewhere like Moûtiers after Col de la Loze as an MTF (after all, that's a climb hard enough that it doesn't need too much before it to be decisive so having a monster stage the next day wouldn't neutralise racing so much), you could go Madeleine north (25km @ 6%), descend to La Chambre, climb Madeleine SW via Montgellafrey (14,4km @ 8%), and then on to Glandon and Alpe d'Huez for a mammoth queen stage.
Or potentially Madeleine north (25km @ 6%), descend through the Montgellafrey side, then climb Croix de Fer via Glandon (23km @ 7%), Chaussy (14km @ 7,5%), and a final 9km @ 8% to Saint-François-Longchamp-1850. Alternatively, extend that stage slightly by descending through the La Chambre side, meaning you can re-do that last 5km of the descent between the Chaussy junction and La Chambre near the end of the stage and climb Saint-François-Longchamp-1850 through Montgellafrey for a 14km @ 8% MTF.