In North America Kingdom Hearts: Chain of Memories is playable on the GBA Console.
On March 29, 2007, Japan came out with Kingdom Hearts ll Final Mix+ which is a 2-Disked Feature. It includes Kingdom Hearts Re: Chain of Memories and Kingdom Hearts ll Final Mix+. So yes, only in Japan is there a Verson of Kingdom Hearts: Chain of Memories on Play Station 2.
Kingdom Hearts ll Final Mix+ is not coming to North America, and it never will. So I would forget it and either buy Swap Magic 3.6, Mod your PS2, or get a Japanese PS2.
@.@ Sorry to bring your hopes down if I did.