I took a long shot and went through a few pages on Google after looking for 1.1.4 Japanese Keyboard mod, and sure enough....I found one. Even better: it works! Instructions can be found at the following website:
http://www.plasticstare.com/plains/2...nji-on-iphone/
For those of you who also want your region to be Japanese:
You will need to mod the same file that you change to get the Japanese keyboard. Instead of adding another setting under AppleKeyboards you will edit the property: AppleLocale. Change this to ja and save.
Note to all users: Do not go to the international menu of your iPhone settings. I have found that this will revert back to a default file and remove the mod (and you'd have to do it all over again). I take zero credit for the keyboard mod, and were it not for this I could not have found the Region property. I have not been able to test this with SMS, but so far it works with all other applications. Good luck, and have fun with your Japanese.
Minna-san, nihongo de ganbatte kudasai.