Can I bind Softether to only one adapter?

In my car I have a Pi OpenWRT setup with a 4G modem and Wifi, where OpenWRT is connected to wifi when the car's parked at home, while it goes to 4G when it's away from the network there. Is it possible to bind Softether only to the 4G? I don't need the tunnel when the car's at home, and it will mess up the connection if OpenWRT tries to contact the Softether server when they are on the same network. I use dynamic DNS for the home network, but that doesn't work on 4G because the cell company does not give out individual IP's to each device. I need the tunnel to be able to get to Home Assistant when the car is not at home.