whilst I have a scan tool that can read these cars and program keys to them the main point of it is the immobiliser codes.
if you do not have those then you are wasting your money. you need to see someone with a C2, C3, carmen scan OR a launch X431 full size unit. all of them will recode the car but with out the imobiliser code you are pretty much screwed. nissan are the only ones that can do that. sending an email to nissan japan is OUT as they will refer it back to nissan oz. FTG nissan would be my pick of the dealers. they do GTR and seemed quite helpful when I took imports there for key work.
start there.