Auto config USB teathered Celluar device as WAN Failover.

[fubar24]

I have a dedicated OpnSense setup running on a older PC. The primary WAN is a Cable Internet service.
I have a working "Failover" WAN using my Android Phone connected using USB tether.
When I drop my phone in the USB cradle, OpnSense detects it, but I always have to manually go to "Interfaces", select the "WAN Failover" device (on Opt6), then click "Save", "Apply Changes" for it to become live as my secondary WAN "Failover" connection.

My question is, how do I make it automatically configured when I connect my Phone (without having to go to "Interfaces", "Save", "Apply Changes" every time)?
Do I always have to manually configure it each time I connect my Phone?