If Covid doesn't upset your plans I think you will be just fine. I think the Valcarlos route is the way to go that late in the year. Even if it is open things can change very quickly on that mountain so better to be safe. I walked starting a few days later in 2019. About November 6 or 7 the owner of the albergue I was staying in said there were already more pilgrims in those 6 or 7 days tha in the whole month of November previous to 2019. That is not to say there were alot of Pilgrims but there were some and the spirit is just as strong. Weather can be really, really changeable. Lots of people got sick. I had bronchial spasms but with a couple of trips to the hospital for some steroid sprays and oxygen and a few days of rest here and there I made it. Be prepared for everything but do not overpack as you can buy whatever you need. I had a small sleeping bag that was good to 40F and we had plenty of freezing nights and I was never cold. You can always sleep in a little extra clothes. A good beanie, buff, poncho, rain pants, gloves and warm socks and layers and you are good to go. Remember don't overpack as Merino wool and the synthetics don't smell Have fun.
I start in Sevilla on October 14th and hope to be in Santiago by about December 2 or 3 and make it to Muxia this time too. One last thing. Check ahead about albergues. Even in 2019 I used Gronze.com and the
Wise Pilgrim and Buen Camino apps. All free. None were more than about 60% accurate on whether or not albergues were open. So the more resources you have the better. Buen Camino