KDE: how to get rid of IBus keyboard selector

I had a similar issue, though possibly slightly different as I don't intend to keep using Gnome.

Removing ibus-gtk, ibus-gtk3, ibus-gtk3-32bit, ibus-lang, and ibus (all ibus-related packages on my system; yours may be different) seems to have worked with no ill effects after a reboot.

You can remove them by running zypper rm -u ibus* - be sure to check the list for anything essential that you do not want removed.