i use i3wm so there are various keybindings you can use.
for mouseless stuff i use xdotool to move the pointer in 16 or 64 pixel increments using the keyboard.
if i could toggle the mouse pointer on and off i would.
First, hint mode: https://github.com/rvaiya/warpd#hint-mode-alt-meta-x
switching to normal mode: https://github.com/rvaiya/warpd#normal-mode-alt-meta-c