```python
from pyaedt import Maxwell2d
import os

# Set non-graphical mode
non_graphical = os.getenv("PYAEDT_NON_GRAPHICAL")

# Create a Maxwell 2D project
with Maxwell2d(solution_type="TransientXY", specified_version="2023.1", non_graphical=non_graphical, new_desktop_session=True) as m2d:
    # Save the project
    m2d.save_project("Maxwell2D_Transient_Example")

    # Create a rectangle and duplicate it
    rect1 = m2d.modeler.primitives.create_rectangle([0, 0, 0], [10, 20], name="Conductor1", matname="copper")
    rect2 = m2d.modeler.primitives.create_rectangle([20, 0, 0], [10, 20], name="Conductor2", matname="copper")

    # Create an air region
    airbox = m2d.modeler.primitives.create_air_region(x_pos=-50, y_pos=-50, z_pos=-1, x_size=200, y_size=200, z_size=2)

    # Assign windings to the sheets
    m2d.assign_current(rect1.id, amplitude=1, name="Winding1")
    m2d.assign_current(rect2.id, amplitude=-1, name="Winding2")

    # Assign a balloon to the air region
    m2d.assign_balloon(airbox.id)

    # Plot the model
    m2d.plot(show=False, export_path="model_plot.png", plot_air_objects=True)

    # Create a transient setup
    transient_setup = m2d.create_setup(setupname="MyTransientSetup")
    transient_setup.props["StopTime"] = "1ms"
    transient_setup.props["TimeStep"] = "10us"
    transient_setup.props["SaveFieldsType"] = "None"
    transient_setup.update()

    # Create a rectangular plot
    m2d.post.create_rectangular_plot(expressions=["Current"], families_dict={"Time": ["All"]}, plotname="CurrentPlot")

    # Solve the model
    m2d.analyze_all()

    # Create output and plot it using PyVista
    # Note: PyVista code would typically involve exporting field data from AEDT and then visualizing it with PyVista.
    # This step is highly dependent on the specific results and data structure, and thus a generic code snippet for this part is not provided.

    # Generate the same plot outside AEDT
    # Note: This would typically involve using matplotlib or a similar library to plot data extracted from AEDT.
    # As with PyVista, specific code will depend on the data structure and desired plot characteristics.

    # Close AEDT
    m2d.release_desktop()
```