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You can also go directly from Somport to the refuge d'Ayous and the Ossau valley in one day via the Col des Moines.
Yes, as @caminka points out the Pyrenean High route is a mountain route and does not always have waymarks though the section from Lescun to Somport is well travelled as it also...
Take the GR10 from SJPDP to Lescun. Then take the Pyrenean High Route for two days to Somport, staying overnight at Refuge Arlet.
Or continue on the GR10 for one day after Lescun to Etsaut in the Aspe valley, where you meet the Somport Oloron trail.
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