One day I'll likely be faced with making my own keyboard layout or losing the wonderful Home/End/PgUp/PgDn/Delete layout I've been used to for years now on a long discontinued keyboard model (I seriously have a box of spares under the bed that I bought when they stopped being made). I've found myself adaptable to the action of many keyboards, but there's some layout features I'm very particular about.
Example: https://www.logitech.com/en-us/product/wireless-keyboard-k35...