Anyway - so today I had some time, so I jacked up the front of the car, and using a 0.8mm aluminum 200cm long "L" shaped piece, decided to give the idea a try.
First, I used some red tape and centered the aluminum piece.
I then used my Dremel and proceeded to make cuts every 10cm so I could bend the aluminum to fit the curve of the spoiler.
After test fitting, I sprayed with heat resistant flat black primer paint:
Then carefully riveted the aluminum piece to the plastic lip spoiler, so that the alum was about 5mm back from the edge of the lip spoiler:
Removing the red tape and cutting off the rivet leads, got me a clean look - you can barely even tell!