Is this proposition at least remotely possible And how would it likely develop post 1820:
Some background:
Spanish Borbon's will descend from Filipe Antonío, Duke of Calabria and not mentally retarded in this TL and more in the mold of his grandfather Phillip and the "Sun King" Louis XIV of France. He is married to Maria Karolina of Austria instead of Maria Luisa of Parma.
Spanish First minister is in the mold of Floridablanca during the pivotal period ending the French Imperial Wars in 1815. Calling all Spaniards, is there someone that might fit that bill?
France has ended with it 1805 borders and the Bonapartists still rule. Napoleon is killed in the Prussian campaign and Joseph either rules or heads the Regency government. Louis still rules Holland. There are still French influenced states in an Alt German confederation here. Namely Westfalen (Jerome). Though I've yet to determine its exact disposition.
There is no retrocession of Luisiana as the Spanish have been more Anti French initially for a longer period in this TL. Its disposition is yet to be determined, but we will call it a Anglo-Spanish dependency at this point under Charles of Artois following an Alt C of Vienna in 1818.
Portugal invasion by Franco-Spanish ( during their later forced alliance) forces has been abortive and and the Braganzas of Avis have never had to flee to Rio de Janeiro.
No battle of Trafalgar with its consequent destructive consequences for the Spanish and French fleets. Naval engagements have been just that. Engagements...and not titanic engagements with overwhelming consequences. These have occurred largely in the Bay of Biscay, Channel, North Sea, Med and Caribbean. With smaller engagements in the South Atlantic and the Indian Ocean.
The Royal Navy remains the dominant force at the close of French Imperial Wars. It has generally gotten the better of the French forces in its engagements, but those against the Spanish have been more even. The Spanish still have a major well trained Naval force in being at the end of the Imperial wars.
Spanish south America: Republican ( from France and America) sentiment has still penetrated the Spanish South American Empire, simply later and building at a slower pace.
Spain has intervened decisively to save the Liga Federal against the centralist republicans of Buenos Aires (post 1815) and the Portuguese provincials of Brasil ( they act without consulting Lisbon )
Paraguay, LF del Uruguay are in Personal Union only with Kdm of Spain, a version of the earlier Aranda plan floated during his tenure, as trade-offs for their intervention and political influence with Lisbon, as well as terr. concessions with regard to Paraguay. Spanish infante's ( there are 5, the youngest born 1888) act as Viceroys for Felipe Antonio until his death ( Haven't decide upon when he should die though 1818-1820 sounds good), where upon they will ascend to head of state as constitutional monarchs in their own right.
In South America, the British invasion of the Plate still occurred but later, with similiar results for the Spanish in the Vice-Royalty of La Plata.
