Yes it is possible. Not less than for Rhineland. This part of Spain had been more of less pacified.
But if you don't want to, this is a choice you can of course perfectly make.
Catalonia was not pacified at all. To compare the pacific land of Rhineland with the Spanish Hell is as comparing Denmark with the Russian Front in SWW.
As example (
exclude small guerrilla actions):
1808: First Battle of Bruch, Second Battle of Bruch, First Siege of Gerona, blockade of Barcelona, Action of San Cugat del Vallles, Action of San Pedro Martir, Siege of Rosas, battle of Cardedeu, Battle of Molins de Rey, Battle of Valls.
1809: First action in Molins de Rey, Second Action in Molins de Rey, Action of Manresa, Barcelona´s Plot, Second Siege of Gerona.
1810: Action of Centellas, Action of Collsupina, Aran Valley campaign, Battle of Vich, Attack to Villafranca, Action of Villafranca, Siege of Hostalrich, Siege of Lerida, Siege of Tortosa, Battle of La Bisbal..
1811: Action of Valls, Attack to Montjuich, siege of Tarragona, siege of Figueras, battle of Montserrat, attack to Medas Islands, action of Igualada, action of Bellpuig, reconquest of Montserrat.
1812: Taking of Reus, Battle of Vilaseca, Battle of Altafulla, Action of San Feliu de Codina, Action of Mataro, Action of Collsacreu, Action of Culell, Action of La Ametlla, Action of Cornudella, Action of Canet de Adri, Action of Massanet, Action of Hospitalet, Action of Merens (In France), taking of Ax-les-Thermes (France), taking of Tarascon (France), action of Beuda, Action of Palautordera, Action of Vallgorguina, Action of Castellfullit, Battle of Olot, Action of Picorell, Action of San Vicente, Second Action of Mataro, attack to Palamos, Action of San Feliu de Llobregat, Action of Arenys de Mar, Action of Molins de Rey, Third Action of Mataro, Action of Palleja etc etc etc.
1813: Action of Villanueva y la Geltrú, Action of Sacreu, Action of Canyelles, Action of L´Estartit, Action of Ripoll, Blockade of Tortosa, Action of Esparraguera, attack to Tarragona, Action of Viella, Action of Ribas, Action of La Bisbal, etc etc etc.
1814: Action of Molins de Rey, Action of Tortosa, Action of Ardiaca, Lerida evacuation, capitulation of Martorell, evacuation of Gerona, Figueras, Barcelona, Tarragona... The end.
Catalonia never was pacified. In 1810: 50.000 French soldiers, in 1811, 62.000, in 1812, 30.000, in 1813, 25.000, in 1814, 30.000 (retreating).
In a What if about Russia... It is wrong any hypothesis that is not based on two premises in Spain:
1. Return the crown to Fernando VII
2. Evacuation of Spain by the whole of Imperial forces.
The War of Spain was very different to any other war that maintained the French Empire.