Ok, I see. If there is a interface that is capable of unicode, it should cover most of the locales supported by Armory.
This is more of a python2 thing than Qt4 really. The solution would be python3, but at this rate might as well do Qt5, which is a task on its own and pretty much at the bottom of the list atm.
The wallet used index is increment only, regardless of what address type you request.