leader marks all targets by selecting a target and pressing F6-F10

F6 bound on leader to set a raid target
F6 bound on first clone to assist leader and set focus

F7 bound on leader to set next raid target
F7 bound on second clone to assist leader and set focus

Then you create a CC macro that casts Hex on the focus target, so when the key bound to your CC macro, all the toons with focus targets will cast Hex at the same time.

Mine is set up very similiar for all three of my 80 teams and my CC macro is a global macro shared between all my toons per account:

/cast [@arena1,exists][@focus,exists] Hex
/cast [@arena1,exists][@focus,exists] Repentance
/cast [@arena1,exists][@focus,exists] Entangling Roots