Brilliant! Elegant solution, and I can vouch for Goo-Gone to remove just about anything adhesive-related... Brumme, you might even try spraying a little around the edges of the emblem before trying Vincenzo's filament technique; might even make it a bit easier to slip n' slide the fishing line underneath.
I did something similar to remove & replace some glued-on handles on a pair of glass cabinet doors & it worked great.
Just make sure you use a few shots & wipedowns with Windex or equivalent to remove the Goo-Gone residue, followed by plain water to remove the ammonia, or you can also just wash the area really well with whatever you normally use for washing the car... if you try to re-apply anything to that area & there's any Goo-Gone residue there, it won't stick worth a damn.