In reply to Santiago111:
Just an update from my previous comment, I wanted to share the information we gathered:
We got back yesterday from an amazing 3 day stay (28th - 30th Sep).
Most hotels seemed to have just plain shut because of Covid but due to their websites not having the functionality to announce a closure they seem to have attempted to manually fudge the system by (almost) filling the booking calendars. The sites are showing a confusing mix of "Not available" with the odd few days available to book. This makes it look like they are operational but busy however all our enquiries resulted in receiving a response saying "Sorry we are closed". This forced us to abandon trying to book through the various hotels own ill-equipped websites and move over and use AirBnB which was a reliable and pleasant booking experience. The owner also upgraded us to the nicest apartment at no extra cost as a token of appreciation.
Several buddies said our original plan was too easy so we climbed the more difficult Brigata Tridentina (VF) (VF3B) first and then the much easier Gran Cir (VF1A) on the following day.
The snow in the valley made the descent time from the rifugio 2.5 hours instead of the estimated 1.5 hours. An experienced German hiker we met told us he'd done a Via Ferrata slightly further North the previous day and he'd never seen so much snow in September. Only 8 other people climbing Tridentina resulting in a 1:1 marmot-to-climber ratio. As for the easier one, we actually had the summit of Gran Cir to ourselves only passing 2 people on the way up and 2 more on the way down.
The few shops and restaurants that were still open were warning us "Tomorrow is last day! We close until winter" so we definitely snuck in a trip as late as possible. They had also started digging up pavements and roads for improvements so each day we queued at a different set of temporary traffic lights. But oh boy do they lay road quick! Impressive.
Although we didn't stay to eat or drink, Rifugio Pisciadu was buzzing with about a dosen people inside. A helicopter tour had stopped for a coffee which was surreal. We were put off going inside by the frosty greeting from a bolshie member of staff at the Rifugio who was mocking my questions and then sarcastically suggested we go ice skating on the barely frozen lake. I got the sense his colleague was embarrassed by his attitude toward us as she was very quiet and literally hanging her head. Is that attitude normal for rigugios? The guidebook describes them as "Plush Alpine Hotels" but is that coded language for a playground for rich wankers reluctantly served on by gap-yar pricks? As my first and only experience I'd love to know if it was representative of other rifugios.
We didn't visit any bivacci.
And Beardy Mike, yes I now understand that most lifts run up gentle inclines that can easily be walked. When I commented before, the guidebook had got me imagining steep cable-cars bridging impenetrable terrain, but now I see they are not required and even the big ones tend to have zig-zag paths below them. The long gangly things at the bottom of our bodies got a lot of use
Thanks all for the info. Your comments were helpful. We're definitely going back similar time next year, maybe a couple of weeks earlier.