Good news! Firmware 2.14 introduced parameter 125 that fixes the original problem!
The bad news is that it’s still not working right due to this problem that has yet to have a solution: Firmware bug: defaultLevelRemote does not work - #13 by mamber.
With bindingOffToOnSyncLevel enabled, the switch now correctly turns on the bound zigbee lights to the same brightness as the switch instead of ~1% when turned on locally. The problem is now that because defaultLevelRemote completely ignores its setting and consistently defaults to the last known level when it was turned off even though the value is set to any other value than 255, I still do not get the expected results when the switch is turned on from the hub unless it was at the correct brightness when it was turned off last.