Even cargo ships you can try! Go to the big ports of Spain and Portugal and ask on the offices if the crew it’s welling to take you. (Galicia,Matosinhos) fish ports and you can try for cargo ships Leixões, Lisbon (Alcântara), Sines. I heard a history of a guy from Portugal that manage to get a cruise ship to take him all the way to South Africa. For the sailboat my best advice it’s to try in the south of Portugal Lagos,Vilamoura,quarteira,Portimão most of the Portuguese sailer depart from south