Hi, pilgr, those aren't really camino alternatives. Number 9 talks about a way to avoid the stretch between Gijón and Avilés, by "dipping down" to Oviedo. This is a totally marked alternative, but most people staying on the Norte just plod on ahead to Gijón and from there to Avilés. Nothing wrong with that, but if you add an extra day, you can avoid a bad stretch and get to see Oviedo at the same time. I think my document describes it, and no need for tracks because the whole thing is perfectly well marked.
And number 10 is just my suggestion to go visit the town of Cudillero, which is about two km down from the Camino at El Pito. The document gives several suggestions on how to do that.
I hope you enjoy some of these alternatives. But I wouldn't try most of them without the tracks, not so much for finding your way along the coast, but more for finding your way to and from the coast. The E9 markers will help you on 7 and 12, and the GR121 markers will help earlier near San Sebastián and from Zumaia, but most of the routes are local trails. And well worth the trouble to find! Buen camino, Laurie