A more effective way might be to ask on page load if the user is an EU citizen. You know, like some financial website asking you if you are a US citizen on page load [0] (i remember marshall wace's old website doing it, it looks like they do not anymore).
And EU traffic being the "most malicious" ? Is this satire, irony, or something else ? Seriously, if I go on website W and they go through all the dark patterns possible to collect and share my data without me knowing about it and I'm the malicious one ? Better read that than being blind...
[0] https://www.quora.com/All-of-a-sudden-Bank-of-America-is-ask...