Is it possible to purchase this block-off plate for cheap, separately?
Or is it a whole different part number, for that version grill?

What do you think? Is it worth caring about the block-off, to avoid creating turbulent air in that part of the engine bay, and making the car less aerodynamic?
I think the reason for pass-through is if you've equipped your car to run Euro dual side-mount intercoolers, B7 A4 setup, etc.