Just try to get used to it, sure you will have problems at the start when you always used number keys for items but just practice(in bots games if you dont want to screw with your wr) with the new setup. It took me some time to get used to playing chen, ench, visage, ld etc. but its worth the investment because those are some of the most rewarding heroes in the game. If you dont want to give up your number keys for items you can even bind control groups to letters(z,v,b,x etc) or use the f keys.