I have found a way to set this using vJoystick and UCR, you can set the clutch and gas pedal as a merged axis in UCR, and then set it so doing nothing with both pedals is 50% on the rudder axis. If you press the gas pedal it goes to 100% (thus right) and if you press the clutch pedal it goes to 0% (thus left). If you press both at once they cancel out and it is 50% again (same as letting go of both pedals).
The brake I set to brake axis left + right. It works perfectly, except for having no toe brake. I can now finally disable rudder takeoff assist and use the rudder to counter crosswinds.