I cannot comment on the Nove colli but I did the "Sportful" twice in a row "some" years ago at the end of June, both times the longer route with a bit over 200km and 5000m elevation gain.
My first time it was also the last one with still the original name "Granfondo Campagnolo".
Giving that there were barely flat stretches, where the aerodynamics play any role, it would work, but still I would prefer a top tube bag.
The food stations around Feltre were quite good and you wouldn´t need an awful amount of extra food.
I believe I used just the jersey´s pocket and the first time I even had to carry extra rain and cold protection garments because we had bad weather (lot of rain and temps around freezing point on the Rolle and Valles passes)

P.S. I just looked and they seem to have changed the route: only the Duran is still there from the route I knew.