I think i understand what you mean but having a full keyboard displayed in krita on a tablet sounds like would make the screen even smaller than it already is. I also don’t think just showing some keys on a docker would be helpful.
Right now, we have the touch docker that has some buttons that are shortcuts to functions, i think this could be a better approach. Instead of showing the the keyboard buttons show buttons for the functions you want shortcuts for.
May seem the same but i don’t see a point in having the keyboard shortcuts being the button labels. The functions would be much more intuitive.
I don’t know how customizable the touch docker is , but maybe some improvements on it might help in this request.