Hi Sir Arthur!
We just exchanged hubbys CNi for local version on 21st July 2011. dont know if its changed again?
First time we've been there we weren't able to exchange it as there's new policy that you have to make an appointment first. So we made an appointment and brought the required documents(original and photocopies) posted on their website. Upon entry and checking of docs we got the local version of CNi on the same day. I think it only took us about 1hour.