I can't find any RVF forks in Thailand, the last set I bought was about 600 USD.
Check with Brett (TurnOne) regarding the air boxes. I know you cannot fit SP1 air box to SP2 because the frames are different. Also I think the hole sizes for the throttle bodies are bigger on the SP2.
So, it may be possible to cut the holes for the throttle bodies larger so you can use SP2 throttle bodies in an SP1 air box. Like I said, check with Brett