KDE: how to get rid of IBus keyboard selector

Please, how to get rid of IBus service/IBus panel when running KDE?

This Gnome(?) keyboard layout manager (?) can get into conflict with the layout set natively in KDE Settings. I need to switch often between CZ and UK keyboard and IBus makes it impossible.

The severity of this issue can range from a visual irritation of having two keyboard layout indicators in the tray area, but it gets much more serious when both systems set conflicting layouts; like when in KDE I set Czech keyboard but IBus somewhat keeps English UK layout:

Can you guess which layout – EN (IBus) or CZ (KDE) – is actually active? The wrong one, of course, IBus seems to always override KDE 🙁

If I quit IBus panel now, it would make it even worse because it's only the tray applet, the GUI bit, what disappears but IBus service is still active. I still wouldn't have my CZ keyboard and absolutely no way to change it.

Very annoying variant of this problem is when user have only single layout setting in KDE, which is by default not displayed in the tray area; but IBus setting always is, even as single layout. User then have a very angrying sensation of whatever he sets in KDE Settings is completely ignored, blaming probably KDE, unaware that the layout indicator belongs to a different system and that is overriding KDE settings.

I once managed to kill all keyboard input completely when playing with KDE Settings and IBus properties at the same time. Really awful UX.

IBus seems to be part of the Gnome stack. So why it gets activated in KDE?
I suspect it appeared there only after I had installed also some Gnome/Gtk applications, like Gimp, GDM, etc.

OS: openSuse 15.0 Linux. This issue was present in previous versions too.

UPDATE:

I also faced issue with US keyboard suddenly appearing as a third option. But twat would be for yet another bug report.

UPDATE 2:

OK, I uninstalled them. Surprisingly it is possible to uninstall just ibus, not the whole Gnome. My GDM still works. BUT – I now face another issue, I cannot switch keyboard layouts anymore, despite setting everything in System Settings and having 2 keyboard indicators in tray, only UK keyboard now works for me. I suspect IBus screwed something in KDE generally.

Ehhh, I sometimes feel that working with Linux means you will spend half of the time solving usability issues and writing bug reports 🙁