https://cleantechnica.com/2020/10/24/transition-one-will-convert-your-old-gasmobile-to-electric-power-in-about-4-hours/

If you own a perfectly fine conventional automobile but want to join the EV revolution, you have two choices. Engineer an electric drivetrain swap yourself, which involves hours and hours of lying on your back on a creeper in your garage, or buying a new electric car. Now, if you live in France, there’s a third way. Transition One will take your current car, remove the existing internal combustion engine, replace it with batteries and an electric motor, and give it back to you in about 4 hours.