Configure/"Un-Apple" an external (Apple-like) keyboard on my laptop?

I am using a 2-in-1 laptop computer with KDE/Plasma.

In tablet mode, I would like to use an old, external Bluetooth keyboard, that I bought some years ago (Satechi ST-AMBK). It is a nice piece of HW - but due to its Apple compatibility, it owns the issues, described in this Arch-Article.

I am a little scared to harm the configuration of the built-in keyboard. Does anybody know a description, how to configure only a second, external, BT-connected keyboard? - or where to start reading, how to configure different keyboards in KDE/Plasma?

Thank you and kind regards,