Hi MrG.
Good to know you are still with us
. I will like to suggest you to do the opposite, that is to use the heater instead, try 3+3 as long as you only go the 50 miles on your trips, then it is better to see the effect of the heating system being used. Otherwise you will scared of what is going happen next winter!.
The GOM is also going to adjust it self to your driving style, if you don't use the heater you will have an abnormal range for winter driving. If you are going to feel at peace with your new car, then you need to use the heater, you will hate the car if you feel you are going to drive without heat.
The EV stuff is a new learning curve, but you can do it, little by little.