Camargo would make more sense with the existing rumours if they were doing Asturias first, but that would then mean three MTFs in a row in week 1 which, I mean, I guess it IS the Vuelta, but still. From a geographic standpoint, arriving in Asturias from León via Ventana to do San Lorenzo E, La Colledoria and Fancuayu, or via Somiedo to do San Lorenzo W, Marabio and Fancuayu, would make sense but the steep final 3km of Cuitu Negru would likely harm any possibility of real action - nevertheless the Vuelta does love to neuter its other stages with things like Farrapona always preceding Angliru. But this would also explain the 'two stages in Asturias' spiel because if they finished at Valgrande-Pajáres, then the following stage could be the Pico Jano one and could easily start in León or Palencia, maybe using the Panderrueda/Pandetrave/Pontón/San Glorio area; something like this suggestion for a Fuente Dé stage from the PRC guys but with Pico Jano instead of Fuente Dé on the end would work (this suggestion predates the climb's actual involvement in the race - it dates back to 2010):
The flip side is that would entail starting in Asturias to climb Pandetrave in full, so it wouldn't be quite the lengthy ascent you see there. Instead it would be 8km of false flat and then the last 5km of the climb from Pontón to Pandetrave, so unless you started in León or Palencia, finished in Cantabria but used Asturias for much of the mid-stage action, it would be difficult to beef up. Coming from Pico Jano being first, it seems counterintuitive to then transfer a decent distance east just to travel west the following stage, especially as it makes it unrealistically long for the Vuelta in recent years to do either of the proposed MTFs, especially knowing that Asturias is likely to only have two stages.
As for Piornal, this was the best I could come up with quickly:
There are a couple of tougher stretches to the south to approach the climb, the
Arroyomolinos side with its 3,5km at 9,3% in the middle, but then only one more kilometre of real climbing before 6 at false flat to the line; and the side
via Rabanillo and Barrado which includes the 5km @ 7,3% section of Barrado.
I have gone for a route which climbs the steep part of the Arroyomolinos side, then only 4km of the false flat, so putting the steep stuff finishing just over 20km from home, descending through Barrado and Rabanillo to Cabrera, then climbing
this side of Piornal from about km7 (Cabrera village) to km16 (Piornal centre).