I don’t know what size barrel jack the B1300 has but I’d go down the route of buying a USB C Gan PD power/charger (they are cheap for the power you need to run a router), a USB C lead and a 12V PD barrel jack plug (see attached image).
I run my GL routers (Spitz and Puli) using this method and it works a treat. For you info, I also run my satellite receiver with a similar set-up.
Feel free to PM me if you need help (eg. finding the barrel adapter or Gan charger).

EDIT: Looks like the barrel jack is a 5521, easy to find (unlike the one that works on the Spitz!)

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