Controlling flying wing with a joystick

Hi there,
I am a newbie on drone area and I would like to control my flying wing with a joystick.
I am using Pixhawk 4 flight controller, RFD radio, Thrustmaster USB joystick and QGC on Linux Ubuntu.
As wing (Durafly Tomahawk) has only 2 controlling surfaces (no rudder), I thought that I will be able to control it with joystick that has only pitch, roll and thrust. But when I tried to calibrate joystick in QGC settings I was unable finish it because I have no yaw axis.
Is there a possibility use that kind of joystick for my flying wing?
Thank you all for your time!