If for some odd reason you don’t find the mouse easy to use, and actually want a 2-in-1 product, pay attention to the latest keyboard launched by Sanwa, from Japan.
As you can see on the image, the keyboard has a touchpad below the keys that works as the mouse – pretty similar to a laptop configuration. There are 2 versions of the Sanwa keyboard, one that has wires and works via USB, and the other version is wireless.
Maybe this keyboard was made with a specific (small) group of people in mind, because I don’t know many that would change a normal mouse with a touchpad. Do you?