Preheat the oven to 400 degrees F. Line a rimmed baking sheet with foil and set a wire rack on top. Arrange the bacon on the rack and bake until just crisp and light golden, 25 to 30 minutes. Brush the bacon with 2 tablespoons vinaigrette, turning to coat both sides. Bake until crisp and dark golden, 5 to 8 more minutes. Drain on paper towels and break in half.
Thinly slice the avocado and season with salt and pepper. Brush the sliced turkey with 2 tablespoons vinaigrette. Mix the mayonnaise with 2 more tablespoons vinaigrette.
Spread the mayonnaise on the bread. Layer the turkey, avocado and bacon on half of the bread slices, then top with the remaining bread. Serve with plantain chips.