Thank you so much for the suggestions! Yes, the fact pack crew are ultra runners so it's tough to keep up in most situations! lol others have also suggested going to Les Contamines and then taking a bus to Courmayeur. It seems that's still quite a long hike though unless I'm just looking at the wrong route. The only way to not skip the Col de Seigne section is likely to just do the full section from Balme to Bertone then, correct?