Got that nasty enduro you'd just love to make street legal? Well, look no futher...
1) Buy enduro (say, an XR600R).
2) Slap a baja kit on it.
3) Call a County Treasurer in South Dakota.
4) Explain what you're looking to do. They'll be quite helpful.
5) Submit forms: this and this.
6) Laugh at Nebraska for revoking your XR600R's plate.
7) Profit!