Did you get this working? My Beryl AX shows up tomorrow and I’ll be doing this.
Gl-mt3000 - Technical Support for Routers - GL.iNet (gl-inet.com)
FYI if you’re just using this for a PC you can change the TTL in Windows registry
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DefaultTTL