I have a very simple AutoHotkey script that remaps [h,j,k,l] to [left, down, up, right] when the LeftAlt modifier is pressed. This prevents me from having to switch to the arrow keys all the time.

I use it for navigating the list of browser search suggestions, or for quickly moving around any program that doesn't have vim bindings.

I've found it to be especially helpful while using the https://www.desmos.com/scientific calculator.