Bond Group Shades

How does one group shades so we can command at certain times for a certain position; overriding the timer?
We have shades that have 3 positions, Open, Closed (which is actually light filtering) and 92% which is room darkening. (Our shades have horizontal veins that tilt)
We would like to hit a command for 92% at any given time to darken a room or area.

I believe we do not support Set Position for group commands.
One solution may be setting separate schedules for all the devices.