He's not talking about driving without a license, he's talking about having expired tags. That shit happens all the time, both here and in the states, and they're not going to deport him over it or anything so serious, you can drop the doom and gloom Castle.
Jack, I personally think it's a dumb idea because I'd rather not get caught doing it myself but only you know a)what the cops are like in your area and b) how much of a fine you're willing to risk. Without going into detail since this is a public part of the forum, some YETIs have ended up doing similar things and never been caught for it. But do keep in mind that it's not just a matter of avoiding being pulled over; if you get into an accident at any point, they're going to check up your info and you'll get in trouble for that for certain. Claiming gaijin ignorance won't get you out of it, this isn't like losing your ticket on a train or something.