Can you expand on that, I've been considering making a "portable network in a briefcase" situation, with a small router and a kodi box with just HDMI, Power, and Network coming out (for when the family travels; the kids connect to the same SSID and are on the home network by default). I hadn't started researching yet, but I am wondering if these support using Wifi as the WAN link, even with openWRT firmware? For example, if we're in a hotel, can I join this to hotel wifi with a captive portal, have it tunnel home, then the kids join it like a hotspot? I prefer openWRT and not vendor firmware because I trust patching the firmware more than I trust a vendor to upkeep their maintenance.
I'm looking at this: https://www.amazon.com/GL-iNet-GL-MT3600BE-Portable-Wireless-Computer/dp/B0GF1J99S4