I'd say so. The base Glamours doesn't imply any changes to the way veils work.
Glamours sets out the effects it is capable of producing.
It describes one of these effects as a 'veil'.
It then gives rules for how to adjudicate that 'veil'.
It at no time references, in any way beyond mere shared terminology, the spellcasting rules, evocation/thaumaturgy veils or otherwise.
Greater Glamours can be interpreted to be a reactionary roll.
The text of Glamours is identical to that of Greater Glamours in that portion that defines its base mechanics.
But neither says anything about changing the standard 1/2 veil penalty for seeing out.
They don't need to specify a change. They set out their own mechanics.
If they
did use that rule, it would be the
only rule necessary to understand the effects of Glamours which would need reference to the Spellcasting rules.
Probably not - unless it was situational. Most stunts give a +1 bonus all the time or a +2 situationally...and this would be 2 shifts. You could phrase a stunt to allow it in some wide situations though...in darkness comes to mind or possibly in artificial light. Really depends on your character's background...how does it interact with his Glamours power?
'+2 to Deceit (or Discipline) when using Glamours for the purpose of veils to offset the shifts required to make the veil mono-directional' seems pretty solidly situational, to me.