thanks for the CSI u tipp. i’m going to check it out and update my findings, here.
thanks @alexherbo2:
https://github.com/alexherbo2/alacritty-extended-keys
EDIT: I deleted my post about using private area unicodes, since I couldn’t modify it any more after that much time has passed. In any case: its superseeded by the superior CSI u approach, which @alexherbo2 has implemented for alacritty above. I’ve adopted it and it is so much cleaner, albeit still asking for complement: Key maps as key locations.