How to remap a keyboard?

I need to develop something in linux at the moment. I use virtualbox with linux on my mac laptop. It is basically ok to work with it but the keyboard mapping is not ok for pharo. I configured the keyboard on the linux to be German (Macintosh) but the special keys are all wrong. Being a long time linux/open source guy I know it will be a major pain to tweak it in linux (I think I did the last time with xkeymap 15 years ago). On the opposite I have the advantage of learning something new if I tweak the mapping in pharo instead of the operating system.

So which would be the entry points in pharo if I want to remap my keyboad? Meaning rearranging the association of a bunch of keycodes to the interpreted character.

thanks,

Norbert