Maybe you could use different timetables in summer and winter, so that only the relevant part of activities is affected, not everything indiscriminately. This would also make it possible to cater to local needs much better instead of simply fixing school hours from 9 to 15 and adjusting the clock that it falls into daylight.
Then local businesses would have to shift their hours to support parents with kids. And before you know it, you’ve effectively shifted everyone’s clock anyway.