So I did a thing.
All network traffic goes out the router to a Mullvad server by default
and *then* to a IVPN server or two 😂 
Discussion
I did the same thing on a portable router that comes with me when I travel. Works great for hotels, airplanes and other public WiFi when using multiple devices. Just connect the router and done. All my devices are good to go.
what kind of router is this?
I have a little cellular one access point...
or is yours something more serious?
I'm using a Beryl AX (GL-MT3000)