Joystick or yoke or flight controller for iPad 10th generation

Hi. My son has an iPad (10th gen) and loves playing with GeoFS and X-Plane.

What are my options for getting him some kind of fun flight controller to use with his iPad?

I know he would have been happy with something as simple as a joystick, but apparently it is impossible to find one that works with an iPad.

I am willing to entertain other options, even if they cost a bit more - like a yoke. But I can't find one.

I just want something to make his iPad experience more "realistic".

Thank you for any help.