Good point.
We held off getting our smallholding until our boys were through Uni, so they could go to both school and Uni in Edinburgh. Travelling an hour each way every day is too much. My school was an hour and a half away so until I got a bike it was a large proportion of time spent travelling. I had no social life as a teenager either and that is even more important to the young. We gave our children a love of the great outdoors by other means without imposing our values on them (which could well have had a negative effect) On the down side our children did miss out on a farming childhood, which is a wonderful thing. So pros and cons whichever way you decide.
While your girls are growing, could you change your career to something countryside orientated, say do a course in countryside management and be a countryside ranger. There are all sorts of jobs out there in the big outdoors, in forestry, wildlife work, SSSIs, national parks, Rare Breeds parks such as Palacerigg.