I'm unfortunately not there physically to help, but my mom has this light switch she needs to remove temporarily and replace the plate. Her "handyman" installed it 'brand new' within the past few years. I told her it looked like it was from the 80s haha. Anyways, she apparently cannot remove the knob for the life of her, shouldn't the knob be able to simply pull off without breaking?
You could have them pry the knob off using a fork. Since the fork is curved, itβll act like a pry bar. Obviously they should wear eye protection in the event pieces go flying.
Edit: PS. I absolutely love your username. π
Thank you! Also the fork is a good idea π