I'll just deal with one point, but it is an important one, because it can affect your planning:
<<"I know the cable cars will be down, but are these places still easily accessible?">>
Some cable cars in the Jungfrau region...such as the one from Wengen to Männlichen have their last runs of the season on Sunday the 27th. But, in general. most cable cars in Switzeralnd will be running at your dates and later. There may be some shutdowns for maintenance, here and there, more common in November.
To check for something you want to do that involves a cable car, use the timetable. It will also help you as you think about going on various day trips. You can see timing and frequency.
Check the specific journey for that day. If it return a message saying it can't give you a schedule for that date, that is a clue.
You can check the My Swiss Alps links for Pilatus and the Rigi, too, and see if the cograil to Pilatus is running. I think it runs into November. The cableway runs all winter.
The Weggis to Rigi Kaltbad-First cable way runs on the 25th, 26th, and 27th.
What cableways concern you?
<<"<<some things will be closed,">>
True in the high Alpine resort areas. Not true around Luzern. Don't know details for Titlis...check the MySwiss Alps link: