You don't need setxkbmap to switch between different keyboard layouts. I also use KDE, but I prefer to use kkbswitch and set up X as follows:Thanks Davide, are you on Debian sid too?
Yes. I switched to kkbswitch because I had problems with KDE's management of multiple layouts, although setxkbmap does not crash here (I am using as a work-around for a bug in xkb-data).
Davide -- A tautology is a thing which is tautological. -- Time flies like an arrow. Fruit flies like a banana.