Yep, same problem for me, I'm left handed and usually on other games (also witcher 2) I could remap the numpad keys, but not for Wild Hunt.
For a PC version you should made it possible, no ?
Please CD Project correct this.
You can rebind the keys yourself in C:\Users\user\Documents\The Witcher 3 and the file input. The IK_KEY= is a keybind, the KEY is the button currently assigned. You have to change for example IK_A= to IK_Q= if you want to move left with Q instead of A, You can use the search program in notepad, but it's still a pretty lenght process to change all the keys, but worth it in my opinion if you're used to different keybinds.
/Simon