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You don't say where/when your existing bookings are, which may impact your extra day options, but you could go to SdC and then do 3 days to Finsterra - then take the bus back to SdC.
My daughter in law has an Osprey Exos 48 and decided to leave the detachable top piece at home on her Camino and had no issues although she did not fly Vueling. The detachable top piece def offers more options.
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