No.
In order to register a vehicle in the United States that was not previously owned in the United States, the vehicle must be imported.
In order to be imported to the U.S., the vehicle must be physically inspected by US Customs and Border Patrol at a Port of Entry.
Furthermore, if a vehicle has not been previously owned in the United States, in order to register it in Montana, a Montana law enforcement officer must physically inspect the vehicle to ensure that the VIN on the chassis of the vehicle matches the VIN on the paperwork of the vehicle.
For more detail on using visitor.us to register a non-US owned vehicle, please consult this article.
For more detail on using visitor.us to register a US-owned vehicle outside of the US, please consult this article.