Why can't you just replace the bulbs with LED bulbs? I did that on some of the ones on my MX-5. I looked up LEDs for the plate lights on my 2007 Z4 and they have them at SuperBrightLeds dot com for just a few dollars: https://www.superbrightleds.com/vehicle/2007-bmw-z4-vehicle-led-lights?make=11&model=1802&year=2007