Hi @whitp
If the 10 day delay is NowTV 's fault, i would try seeking some form of compensation.
https://help.nowtv.com/article/auto-compensation
Can't help sorry setting up a third party Router where i am an AV Guy and my IT Skills are non existent.
Hopefully another forum member will come to your rescue or use the search box towards the top of the Community page to see if you find any hit results on the information you are after.
I don't know if you can get your hands on an old Sky Router, where the Sky Routers that look similar to the two NowTV Routers on the photos in this linked article should be plug & play on the NowTV Broadband service.
https://help.nowtv.com/article/choose-your-hub