Hah, well I have a travel router as well I use for things like hotels, but I wouldn't really want to bring it to a coffeeshop because the setup process is a bit onerous. I need to get the travel router to connect to whatever the coffeshop's wifi is and then get through its captive portal. The last part can be tricky in my experience though it's certainly doable.

Personally I wouldn't bother with the hassle and would instead just rely on an on-device VPN which I now would need to ensure is protected from this type of attack.