Okay here we go.
Before we begin, I suppose that you all know how to set up an adb session with your phone..
And you need this program to be installed on your PC:
Free Hex Editor Neo
You should make a backup of your current working ROM with your favorite recovery, so if something goes wrong, you can just reflash the backup, instead of loosing all your data and settings.
Now start a cmd prompt on your pc (Windowskey+R, type "cmd" hit enter)
browse to your platform-tools directory (cd path-to-platformtools)
Make sure your phone is connected:
And execute these lines:
mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system
You can now read and write to the /system folder on your phone.
Next you need to pull the *.kcm.bin file you'd like to edit. (For the OP this is most likely the "vision-keypad.kcm.bin" or the "vision-keypad-wwe.kcm.bin", but if they aren't the ones used.. then try and edit the "qwerty.kcm.bin" or "generic.kcm.bin" files)
This is done by entering the following:
adb pull /system/usr/keychars/vision-keypad-wwe.kcm.bin /tmp/vision-keypad-wwe.kcm.bin
Or one of the many other files if this one isn't working.
Minimize the cmd screen for now and browse on your computer to the platform-tools folder (or the folder where you executed the adb from) there should be an new folder called "tmp", in that folder you'll find the file you just pulled from your phone.
Hit it with a right mouse-click and click "Edit with HDD Hex Editor Neo". (If that option is not available, start the Hex Editor and open the file from within the editor)
The first row and columns are blue, except for the first one on the far left-top side, this one is white.
Click it and type: "0000027c" and hit enter.
Now there are some hexadecimals selected in green. On the far right side of that row should be something like this: "6...Z.9.z.Z"
(If that isn't the case, find the line that does look like that and edit that line)
In the green field you've got, change the value to: "a3" (just type)
The cursor will automatically go to the next value, which is "00" leave that.
Press the arrow-key to the right once and edit that value to "a3" as well.
The field on the right side should now display something like: "6...Z.9.z.Z.£.£."
That's it, save the file and push it back to your phone by entering the following in the cmd window you minimized:
adb push /tmp/vision-keypad-wwe.kcm.bin /system/usr/keychars/vision-keypad-wwe.kcm.bin
Then restart the phone and it should be working!
I used the file in the .zip attached as my example file, to see how to do it.