Heat 1/2 tablespoon of oil in an 8-inch nonstick skillet until it shimmers. Scatter one-sixth of the shrimp in the skillet, season with salt and cook over moderately high heat until pink, about 1 minute. Scatter one-sixth each of the scallions and bacon in the skillet and cook for 1 minute. Ladle 1/3 cup of the batter over the shrimp, scallions and bacon, spreading it evenly. Cook until the bottom is golden and crisp, 2 to 3 minutes. Flip the crêpe and cook until golden and crisp on the second side, about 2 minutes longer. Transfer to a plate. Repeat to make 5 more crêpes. Serve the crêpes hot, with the dipping sauce on the side.