Living in the countryside is not an unsustainable choice as long as you plan carefully. Online shopping is convenient if you have good internet connection, and that you accept that there maybe no local shops, sometimes not even a pub, and healthcare can be some distance away.
I lived in the countryside when my children were young but gradually overtime we lost our shop, our bus service was drastically reduced and our medical centre closed.
Now I live close to town, bus stop round the corner with a 10 minute service to town. I currently can and do drive but realise that I may not always be able to, or even want to drive in the future.
You could rent for awhile in your chosen part of the countryside and then see how it works for you now, and assessed how it will work in the future.
Passports not in the drawer I always keep them in. Turning the place upside down.