Would an early Soviet carrier make later-style amphibious operations plausible in the Baltic?
Short answerNo; 1930s Soviet amphibious capability was riverine and inshore, without the landing craft and aviation enablers of the later fleet.
NotesLater Soviet amphibious methods cannot simply be projected back into the early 1930s. Contemporary operations relied on riverine craft and small inshore vessels. The helicopter and landing-craft capabilities associated with the later fleet were absent. Adding a carrier would therefore not create the means to conduct those later forms of amphibious warfare.