Would you consider a middle ground for movie watching? I understand you don’t want to hook up your LG to the internet, but would you considering booking up a fire stick, Roku, Apple TV, etc device for the purpose of streaming movies?

You’d avoid the forced upgrades on your LG and suffer a minor inconvenience of streaming from another device which does have internet access. I don’t know what the ad’s situation is on those devices, but I’m sure with some research you could find a streaming device that hopefully meets your requirements.

Another option is cast all the videos from a tablet or computer to the TV.