If you want to kick the habit...

One-box in pvp to learn (or 2-10 whatever, but only 1 is needed).
Unbind WASDQE, unbind the arrow keys.

Have no form of movement bound except for the mouse.
You'll adapt to mouse movement, pretty quickly.
Do it for an afternoon.. like 2-3 hours.

Consider leaving the Strafe keys bound, they're useful for movement and pvp.
If you right click while using a turn key, that strafe's as well.
However, you want to train to not use these keys, so if you keep strafe, ensure its via QE and not AD with mouse clicks.
The whole point is to stop using WASD for pvp movement.