Hi, amancio,
I agree that winter is a great time to dream about the Camino. I have been told that the albergue in LaFuente, which used to be in the old school, has closed. It was a very nice place, sleeping room downstairs, kitchen upstairs with microwave, etc. But I assume the route still goes through Cícera, after LaFuente, where I've heard there is an albergue, but I haven't stayed there. I think rayrosa's website is great, and I think they walked the Lebañiego/Vadiniense last year or two years ago.
Oh, the amount of tarmac is painful, all the way to Mansilla de las Mulas. It did me in. I took my first bus ever from Gradefes into León so that I could rest my feet for a few days. And the walk into Potes was undoubtedly one of the most dangerous and scary camino stages, through the lovely gorge, along the river, but oh my the traffic was heavy and the shoulder very narrow. I believe, though I'm not sure, that they have re-routed that part, but if you take the recommended route up to Cabañes, you will miss it anyway, I think. The albergue juvenil in Cabañes was full of school children when I called from Lebeña, so I just slogged into Potes.
I would love to go back to that camino, but not till they get rid of a lot of the asphalt. I remember walking into LaFuente, and seeing a local farmer coming down off a path from the hill down to town, and I asked him about paths that parallel the roads. He told me that it would be easy to connect a walking route from San Vicente off road, because there are lots of old farm tracks around, but I guess that's a complicated process. At least from Potes to Fuente De and Fuente De through the Senda de Remoña there is good off road walking, but then the asphalt starts again into Portilla de la Reina and just never ends!