I would go even further, not just simplest, totally networkless. I don’t have the idea of being sit into a cel phone with tires.
Does it have to be a pure EV? Probably the easiest/simplest would be a Chevy Volt of some extraction, probably the first model and not the revision if you want to avoid as much computerized BS as possible.
Mechanically speaking, a hybrid has all the complexity of gas and electric combined, except for the transmission.
My 2019 Hyundai Kona EV Limited is pretty simple: front wheel drive, power windows, locks, and driver seat but everything else is manual (mirrors, door handles, hatch.) No navigation system but supports CarPlay and Android Auto, lots of physical knobs and buttons.
I let Blue Link expire and hardly noticed a difference. There is no setting to disable the cell radio, but presumably you could open it up and ground the antenna or something.
A 2015 Nissan Leaf. Low range, but minimal problems.
The Polestar 2. It’s a great, simple, sporty car.
A simple e-bike or electric scooter/motorcycle. Cheap compared to a car, especially the e-bike, and very low running costs.