I have a mk2b/Mk3 5dr Active, and can confirm: my boot lid has a huge round Fiat badge with an indent. The front grille also has a round badge, but even if you remove it, the grill itself has a round plate (to support the badge) which doesn't come off. Only way, is to find a debadged 3rd party manufactured grille - which I'm having difficulty finding.
http://caraudiosecurity.com/shop/product/products_id/9642.html
there is a nice debadged grill for you