I had forgotten about this, as I have not stayed in a hotel with a portal for a few months now. I’ve looked at my notes, and and wonder if an alternative, and perhaps easier method for GL-inet might be to arrange a proxy on a different port . The kind of thing where
USER Device Port 8080 <> Beryl Proxy <> Beryl’s Outfacing WiFi Port 80 <> Hotel WiFi
This has been on their research list since March 2021 - and as the primary purpose of a Travel Router is to use while travelling in hotels , you would think this goes to the top of their priority list.
Best would of course be an inbuilt Browser and the ability to use VNC or similar to access it. That would make sure that ANY kind of future captive portal could be handled as a browser was making direct connection as the Hotel would like.