Just turn off the keyless entry in the MMI. How hard is it having to push a button to open the doors ?
Not sure what its like on other cars but you have been able to turn it off on Audis since at least 2016.
All the carry on with "Faraday pouches", just stick your keys in a metal tin or put them inside the microwave oven. The only issue is the the battery in the key will drain much faster as it will initially try to increase the power level to communicate with the car.
The very latest keyless system detect if the key is stationary. If it is then the key stops transmitting, so there is no signal for the scrotes to amplify.
An even better option, instead of people filling their garages full of crap, put the car in it at nighttime. People might find its also is much more pleasant on a cold winter morning. After all its likely to be the second largest purchase that people make, second only to buying a house.