Keyboard remapping not possible for four keys

I've just bought an Asus notebook with a keyboard that does not suit me: three keys are useless and I would like to remap them but I'm not sure that's possible. This notebook came with Windows11 Professional installed, I replaced it with Debian12. This problem is the same as the one described here On the right-hand side of the keyboard, the first four keys above the numeric keypad are, from left to right: Calculator (launches calculator), CE (= Clear Entry), -/+ (Change Sign) and On/Off. The problem is that F9 and + / - keys have the exact same function and also CE and Del key act the exact sa

Question by mazda on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.