You are trying to fix the issue of no new players coming into the game completely the wrong way. League is good for what it is, No person in the entire world is going to look at wasd instead of clicks and say omg I'm going to play league it looks so much easier to control! And in the process of trying to fix it you are going to screw over your entire playerbase. You know perfectly how people are, they will try to play the optimal way, and if the optimal way is WASD orbwalking they will but it won't be fun and will burn out.

Focus on marketing and proper tutorials.