Do you at least have some kind of MMO mouse ?
All your movement can be handled by the left-right press. Middle-click to keep moving.
The hotkey on the mouse make skill trigger much easier. You should be able to double
your skill amount on your mouse by using the weapon draw mecanism.
And the keyboard would only be an extension for least used skill.
Moreover if it is your left hand that's available, just overwrite your numpad configuration
the key switch differs depending on the num-lock state, you will lost the default configuration
(along with the arrow key and the set of 6 key above it) but in you case this might be more interesting.

With this configuration you should avoid playing class who keep moving in circle path (monk)
(maybe if you bind rotation key and focus on you mouse). I cannot really recommend any class
since I only played a SMN. But with some organization you should be able to handle any class.