Your best option to retain the lease...replace the rear bumper shock absorber bar with the euro spec version with two tow hook holes and use the euro bumper bike hitch you want. Plus your bumper cover already has both cutouts. Here is the part number:
It's an easy swap, you'll just have to find someone (maybe ecs) that can source euro parts.
BMW will never know the difference when you return the car.
Also, I did point this out as a potential issue before your purchase ....it's bummer you were not able to pop the two plugs to verify.
Last edited by x3brian; 11-22-2012 at 09:21 AM.