My plan (I Think)
Many thanks for the all of the suggestions. There is a lot of great information in this thread.
If I didn't like my current router, I'd consider the mesh solution (I've been watching that technology for awhile now) but the existing router is handling everything else quite well and see no reason to spend the money and disrupt the existing network - Alexa, smart plugs, iPads, cell phones and an occasional untethered laptop.
I had a friend send me pics of his newer low-voltage panel. That's a great idea and much better than what we have here in Pennecamp. But my low-voltage things are done differently - the irrigation controller is in the house, but there is an external Comcast box and an external 'phone' box. If I had the low-voltage panel inside I'd be tempted to convert the telephone wiring.
A special thanks to the responders who provided input on the telephone wiring conversion.
So my plan now is what I was going to do and was suggested early on - hire an electrician to run cable through the attic and install two jacks. That will allow me to connect the wife's computer to the exiting gigabit ethernet network. (The Gig-E isn't really necessary but comes in handy sometimes.)
Thanks again to all who responded.
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