With Amazon Sidewalk I don't think not hooking it up to the internet is an option anymore, unless you live out in the boonies
"Anymore"? So far there's no evidence any TVs are using it, so you're safe for now.
Anyway, any solution that involves opening up the enclosure is one just for the nerds.
Even so agreed on the latter point. I have a full EE lab at home but even I lack the space to work on a modern large format display.
Documenting optimal copper tape positions for the back of the display for different models is the move.