On Windows, you use AHK to do that and way more. You know about Caps being Esc alone and Control when chorded? Likewise, AHK can turn the Alt keys in Home/End

On Windows, you use AHK to do that and way more. You know about Caps being Esc alone and Control when chorded? Likewise, AHK can turn the Alt keys in Home/End when pressed alone, and the Shift keys in PageUp/PageDown. One handed Alt-PageUp on the left hand side of the keyboard becomes pressing and holding the left Alt then pressing and releasing the left Shift.