Hi, Ian,
In the short document I put together, you'll see all the accommodation I was able to find through various internet searches. It looks to me like accommodation is not a problem, at least not if you are willing to stay in private places. I've also put a list of reported albergues at the beginning, though these are not pilgrim-specific places and I don't know anything about what they offer.
I'm not sure how many kms a day you like to walk, but I've put distances in there as best I could and two different suggested walking plans, one for 9 days, one for 12. I'm sure there are others.
I know there has been a fair amount of politics surrounding the status of this route, and I am not at all sure what the Archdiocese's attitude is about it, most importantly, whether it will qualify for a compostela, if that's an issue for you.
But Ivar has told us that the Xacobeo has recognized the route, so that's one step.
Hope this works for you -- I'd get a lot of vicarious enjoyment from reports back from the Camino de Invierno! Laurie