The term "shrewd ploy" can be replaced with various synonyms depending on the context. Some possible alternatives include "cunning strategy," "devious maneuver," "astute tactic," "crafty move," "clever plot," "strategic gambit," or "sly ploy." All these phrases convey the idea of an intelligent and sometimes sneaky approach to achieving a particular goal or outcome. Depending on the intended tone and message, different words may be more fitting. For instance, "astute" and "shrewd" could suggest a positive connotation, while "devious" or "sly" might imply a negative or manipulative intent. The choice of synonym will depend on the writer's purpose and the desired effect on the reader.