If you can do Function plus other keys to use the numpad, you can work your way around it. 2 4 6 and 8 are the arrow keys, + is the menu, Enter is confirm, 0 is cancel, 5 is start, . is assist, - is support and 1 3 7 and 9 are the four triggers. You can start a new game this way and change your controls in the menu once started. Those changed controls will stick even if you start a new game, assuming you set the controls to "Custom" before saving (it will retain the previous set controls). Keep in mind the controls revert back to default in the name entry screen, though.
You can also use the keyboard patch. Either work.