Those badges go for quite a bit of money and those who really need them would probably be upset. It is your car though, and we can't stop you from doing what you wish, but if it'* not a 40th, why badge it as one? I personally don't see the point, but that'* just me
Those who badge their cars as something they are not WILL get a little heat for it from some people. People have badged their SEs as SSEi'*, and it doesn't result in much acceptance from people, especially those that actually have the real thing. This goes for any kind of car not just Bonnevilles.
Doing things like changing rims or adding interior features is different, because those things do not 'say' you are something else. But badges clearly designate cars as something in particular.
EDIT: Moving to General chat....