There are other possibilities
http://www.bbesound.com/bmw/HIDinstall/
or
Low Beam Failure Fix
(RFix)
Price: $29.99
Sale Price: $19.99 http://www.xenondepot.com/product.php?product_id=126
You can solve low beam warning in three ways - get ballast specially designed for it, get a resistor (I like this, see link above ) or even simple bulb or modify your LKM.