Tschou Michu.
I am from Switzerland, too, from Kandersteg to be exact. I am living in the US now and purchased my pearl white 370Z Nismo two weeks ago. Its a beautiful car and I understand your desire to get one, too.
I have purchased my first car (a 280ZX) in 1980 in Saudi Arabia and I did import it into Switzerland. I was allowed to drive with the Saudi plates in CH for a year on a temporary import bond. After that, I had to either export the car again or pay the customs duty. At that time it was Fr.104.50 per each 100kg of vehicle weight.
To get the car registered, here is what I did:
I drove the car to the importer, Nissan Schweiz, in Urdorf SZ and told them that I needed a letter from them stating that the car I purchased in Saudi is essentially the same as the model Nissan sells in Switzerland and that I would be allowed to register the car using their import license. Nissan Schweiz had no problem issuing this letter for a "small fee" and the whole deal took less than an hour. I had to pay Fr 350.00 for the letter but this was small change compared to the cost of obtaining my own import license. I then arranged for an appointment at the Motorfahrzeugkontrolle in Thun. I took the car with my letter from Nissan and the inspector said that he would have to verify a few key dimensions of my car and compare them to the data they have on file. As with the Nismo compared to the standard trim, my 280ZX was not exactly identical because it had the 5mph bumpers which made the car about 10 cm longer. I was well aware of this fact and when the inspector handed me the end of his measuring tape, I knew that nothing could go wrong. I was told to holds the tape in line with the front bumper and he would take the reading at the back. Guess what, the reading he took was perfect because I was able to move the start of the tape just a bit to the back so that the car would not measure longer than the standard CH model -
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So, I suggest you call Nissan Schweiz and ask them if they would issue a letter for a gray import Nismo under their standard license. All bets are off if you cannot get this letter. If you can, then you are pretty much home free and this takes care of all the stickers and everything else. At the MFK, you will need to be ready to negotiate if necessary. Showing up with this beautiful car is an advantage right off the bat if it is clean and shiny. If the inspector asks you if he can take it for a spin, then let him and he will not turn you down.
Bis spaeter