What have I used too big a hammer on?

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Yesterday there were a couple of hours long xfinity cable outages and
I decided to try to connect over 5G via my phone's hotspot and the
built in wireless on my computer's motherboard.

It could connect, but I couldn't see anything on the internet, I suspect
because I beat NetworkManager into submission with too big a hammer
on my normal network setup where it kept not using my internal LAN
DNS, so my big hammer was to edit

/etc/NetworkManager/NetworkManager.conf

in in the mail section add

[main]
dns=none

Then remove the /etc/resolv.conf symlink and replace it with a fixed
content file with my local search and dns server so I can lookup
names for all my local stuff.

So, my question is: How to override DNS the same way, but only for
my hardwired ethernet connection, while allowing me to disable that
connection and use my hotspot in time of comcast outage?

Heck, it would be even better if I could use both at the same time,
the local ethernet to get to other computers in the house and the hotspot
to access the internet (but I have a feeling my brain might never
be able to wrap around that).
--
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