No need; not reporting it is already a Common Law Offence or a Statutory Offence in most English-speaking countries.
From the website of "murrayslegal.com.au:
"Misprision of felony was abolished in the U.K. in 1967, and all Australian States followed.  New South Wales replaced it with a statutory offence under s316 of the Crimes Act 1900, making it an offence not to report a “serious” crime (one with a penalty of 5 years or more in prison) unless there was a reasonable excuse. The other States went a different way, making the concealment of a crime an offence only if the concealment was in return for some gain.
It does remain an offence in the US Code, along the lines of the NSW offence, § 4 imposing up to 3 years jail on a person with knowledge of the actual commission of a felony who conceals it and does not as soon as possible report it."
I don't know if the U.K. (excluding Scotland) has replaced it. 
One of the many ways that Common Law runs rings around Napoleonic Code of Europe.