Thanks, this worked for me as well!
Go to AirVPN's website > client area > Generate new config
Choose advanced
Choose Linux > Wireguard UDP 1637 lightweight and efficient UDP connection
Scroll down and choose your country (tip: Switerland)
Scroll all the way down and generate and config file
Place the config file in your appdata/wireguard folder (for my instance: /mnt/user/appdata/binhex-qbittorrentvpn/wireguard)
Go to the docker settings and change container variable "VPN CLIENT" from openvpn to wireguard