Do the US spec and the JDM use two different key fobs or do they have different security systems? If they use the same there's several places to buy a used one for about $40 USD or less. Let me know if they're the same.

REMOTE KEY FOB: PART NUMBER: BAB237131-013

Here's a post with some sources.

http://www.vehicross.info/forums/sho...3&postcount=16

http://www.vehicross.info/forums/sho...36&postcount=4