If caught with the false plates you will be fined for it. Possibly done for impersonating a police officer too!
As for the "naughty" thing....depends on what and the corroborating evidence to ID you personally.
Photo evidence on a speed camera for example.
It's not rocket science....you have to be caught to be done.
Like someone reporting you for drink driving/no insurance. You would have to be caught in the act, not just the say-so of someone.
Simples!....
