how would you change your apparatus to silver plate the spoon from nickel-plate?

Silver plating can be done on nickel spoon. Such electroplated wares are called electroplated nickel silver (EPNS).
 
Silver plating is done by dissolving the object being plated (cathode-  a spoon) in an electrolyte (liquid between the electrodes, silver cyanide, AgCN). Then, current is passed from the cathode of an electrolyte cell into the anode (a silver object). Positive silver ions flow into the cathode from the silver cyanide where they are neutralized and stick into the spoon being plated as silver metal. The anode bar loses electrons to become silver ions until it dissolves. Meanwhile the silver metals are transferred to the cathode and spoon is plated as silver.

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