Comment by figmert

GL.iNet routers don't even need this. It has an option to pass through captive portals. So you connect to your GL.iNet AP, then you set it up for the hotel WiFi, tick the option for passing through (it essentially disables VPN, AdGuard Home and other things if enabled), it will then link you to the captive portal where you can log in as you would otherwise.

Once the internet is active, the GL.iNet router will then re-enable things like VPN and AdGuard Home.

Since these devices are OpenWrt underneath with a pretier ui, I presume this is all possible on any OpenWrt device.