You could also just cross the border near Toblach and use the Biathlon and training infrastructure in Obertilliach.Goms decided against organizing a Tour de Ski stage. FIS is working on an Italian replacement venue so it will be an all Italian Giro di Ski next year.
Altitude and they do have some demanding laps.
But I guess starting the Tour in Livigno and then going to Toblach before Val di Fiemme is the obvious call.