It would surprise me if there was no guy in the entire US where one can road register his/her 2 stroke play-bike...
But if you get it done in The Netherlands, of course it would have a dutch licence plate from Holland, so you should have take it through border customs, some other inspections, and shipment, and having it re-registered for your area perhaps...
Also, if you have it plated in another coutry, it must comply their own local country road legal standards, wich might be somewhat different to the US. So you'll have to change it again. Plus all the shipping.
But you should only do this unless you know that you got a great bike wich you will be keeping.
Otherwise it might not be worth all these hassle...
Jos van Vugt doesn't have an official website, and it's difficult to find his phone number, but i'll keep looking.
You could try to e-mail this company MX 4 All. They also specialize in plating dirt bikes.
http://www.enduro-ombouw.nl/assets/s2dmain.html?http://www.enduro-ombouw.nl/They know pretty much all the loopholes in laws for different countries.
They say it's impossible to road-legally insure a Yamaha YZ, so they take it to Germany where it IS possible.
Then take te YZ with german licence plate back to Holland , and then they will happily give you a dutch licence plate no problem... The whole proces might cost you around 1500-2200 Euro's. I don't know how much that is in US dollar.
For a 430CR they might give it a 450TC licence plate, and also register it as such.
As this is also the norm for many older CR500's, who are actually insured on paper as CRF 450X,
or a CR250 is also commonly seen with XR250 paperwork, and therefor legally aknowledged as such...