You also used the worst possible climb before Tre Croci, with something more it's an acceptable stage.Col Drusciè!
My only fear is that they'll want to go through Cortina, so that it'll be Tre Croce > Cortina > Col Drusciè rather than Giau > Col Drusciè.
It could be the last stage in the second week or the first in the third:
Udine > Cortina d'Ampezzo (Col Drusciè)
182.0 km, +4338 m. Bike ride in Passons, Friuli-Venezia Giuliaridewithgps.com
Not sure if there is enough space at Col Drusciè to host a MTF, there is a parking lot, but the parking lot seems big enough.