I don't know how simple this will be but it should be possible to tether the phone to one computer that will act as host and set up Internet connection sharing on it. I'd choose one connected via ethernet to the router to maximise overall speed. Don't know if you'll need to fiddle with IP address assignment via the router.
This might be helpful:
https://www.lifewire.com/how-to-shar...indows-2377463