I drive maybe 1500 miles per year and if I calculate in petrol usage for the next 10 years where a car wasn't produced for me, it will use less CO2 overall.

Since I live where the electric grid is already at the limit, my options to install a charger are limited as well. I could use 230V 16A to maybe charge it very slowly...

Batteries also degrade with age and we will have to see how a used car market will look like. I have a car for luxury only since my work is a few hundred meters away.

If you buy a new car anyway, an EV would be a good choice provided you have the means to charge it. Many people in the cities don't have that option. But it wouldn't be too helpful if you replace your current car just for the sake of it.