I was succesfull to change the keyboard from QWERTZ to QWERTY
I wont recommend it, cause the size of Y and Z are a bit different.
The Z is ok and u wont notice, but the Y has 0,5 mm difference on the sides.
U can get used to it very fast though. And u dont really notice it.
This all without voiding warrenty stickers..
Now i need a english rom to enable QWERTZ ->QWERTY