This is brilliant,
@Charrito. And yes it saves a lot of distance. Like Laurie, I felt that part between Villavirja and the castle were really special, but this is worth tryng - especially for those who have done the Invieno multiple times or who are short of time.
On OSMand the yellow is the camino, anf it (the dotted line) very neatly cuts across both the meanders of the road and the much longer way upslope via Villavieja and the castle.
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I was wondering about the slope, so I went to the IGN topographic map - to see that yeah, it goes up, but less and much more gently than the way up to the castle.
View attachment 140261
One place that may need a bit of care is around that quarry - the topo map is a bit ambiguous, but Google Map on sattelite view makes it clear you need to stay near the road through there. It
is public access though, yes?