Heavy stuff: How do you share control without shared vision?

[Chris-Yamaha]

When a player leaves in Helm's Deep, I have a trigger that shares unit control and vision. However, the visions for players vary, therefore when one player should have fog of war on one side of the map, instead he loses it. Stuff like that.
Is there an easy way to make a trigger that just shares controls, or maybe an easy way to change ownership?

 

[Pharaoh_]

Player - Set Aspect of Alliance.

• Player - For Player 1 (Red), turn Shared vision Off toward Player 2 (Blue)
• Player - For Player 1 (Red), turn Shared units On toward Player 2 (Blue)

 

[Chris-Yamaha]

Pharaoh, you continuously make me feel naive with these short, right responses =P. Thank you.