The wording of Conveyance is “This does not count as casting the teleport skill” yet when you cast Focus, it uses the teleport skill, triggering its cooldown. Additionally the cooldown for both Focus and teleport do not begin until you stop channeling. I would assume this is not intended as it makes the skill completely useless.
When Conveyance is not selected, the cooldown starts the second you use focus, and continues throughout channeling. I assume this is how Conveyance is supposed to function as well.