Something that hasn't been mentioned here is: What is the likelihood of impound and or destruction? I'm not going to tell you it won't happen to you, because it could if you have a vehicle here illegally, but every case I've ever heard of involves a shady importer, knowingly importing cars illegally, and knowingly selling them illegally. The government goes after the importer (usually after there have been complaints filed), then tracks down all the contraband vehicles, impounds and destroys them. Never mind that the buyers may have had no idea that their vehicle was imported illegally, or that they have them registered and insured, with license plates and taxes paid. "Whatever", says the government, "it's here illegally".
I'd be very interested to hear if anyone knows first hand (let's try to avoid the internet "alternative fact" rumor mill for now) about any individual, just regular guy, importers who have had their vehicle seized. Guys like me or Ian or Joe who maybe bring in a car now and then, but that's not their primary business. Or guys who've just brought in one, even if it was brought in illegally (if it's been seized, there's nothing to hide about the nefarious activity). I've never heard of it happening, but it may have.