Input Method in IBus Preferences conflicting with the Layouts tab in MATE Keyboard Preferences
On Trisquel 11 Aramo with MATE, it is my understanding that users should add and configure keyboard layouts exclusively through IBus. These settings are to be found in System > Preferences > Other > IBus Preferences. However, many users follow the usual and somewhat more intuitive path System > Preferences > Hardware > Keyboard instead, which will inevitably create glitches with IBus.
Related threads in the the forum:
https://trisquel.info/en/forum/trouble-getting-macrons-vowels#comment-171866 [EN]
https://trisquel.info/en/forum/i-could-not-enable-shortcut-switch-keyboard-layout-gui-i-edited-etcdefaultkeyboard [EN]
https://trisquel.info/en/forum/choix-du-clavier-dans-lapplet-de-notification#comment-173756 [FR]
Is there a way to merge IBus preferences in such a way that they would replace the "Layouts" tab in the "Keyboard Preferences" UI? Else, users will keep taking the wrong path and fumbling in the wrong place until someone tells them to revert to default settings there and use IBus Preferences instead. Or would it be possible to make IBus non-default again (possibly not a good idea, just exploring possibilities) so that only users who know what they are doing, and how to do it, would use it?
Another example of IBus off-road in MATE (with anthy) :
https://askubuntu.com/questions/1144489/unable-to-type-in-greek-using-ibus-but-can-type-japaneese-and-english-as-well/1144490#1144490