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The N260 between Campo and Ainsa is a fast road, and A138 to Bielsa also. If you don't need to visit Ainsa you can use part of this loop to reach Laspuña:
https://zonazeropirineos.com/en/rutabtt/zz-002-2-back-to-the-pena-montanesa/
I am considering the route below myself.
If you lookt at the OSM cycle map on RWGPS, there is one called TP which I can only interpret as Trans-Pyrenees
https://ridewithgps.com/routes/30038482