I don't get why they advertise themselves. You'll blend in a lot more if you use a normal plate and simply never renew the registration. You rarely get pulled over for this and ticket is so minor that it's easy to just ignore it and never show up to court. But more often than not the cop will just tell you to renew it ASAP and send you on your way. Be polite, apologize, don't argue/mention any sovern citizen bullshit, and most importantly: don't be brown-skinned, and usually they'll just let you go without even so much of a warning.