Change layouts in keyboard + iOS {objective-c}

I am creating a third party key board that will offer different languages. for both iPad and iPhone.

Keyboard will have different number of keys depending upon the language chosen by the user. Also the button layout will change as soon as the shift key is pressed to offer more characters {to be done programatically} and it should work in both portrait and landscape mode.

i am using XIB files to make the keyboard layout.

I have a possible solution for this to work : creating different XIB files for portrait and landscape mode for my custom languages. creating 2 different {portrait + landscape} XIB files for English layout. loading the different xibs on different conditions.

I am unable to confirm that if it is a GOOD WAY to PROCEED or is there any other way.

Any suggestion would be great. Thanks in Advance!