Hey!!Yes this is how i managed to get my OEM blue seatbelts. Shark Racing were very good and used them before.
Its not too hard to get done once you have the OEM belts as them someone will just have to remove the webbing and then use it on the original belts.
I have told a few people now but i do believe i was still the first person to actually get the OEM blue belts fitted into an i30N
Do you have the part number by any chance?