I tend to think drafting wardens would be a bad idea.  Exerting a certain amount of social pressure would certainly be fair, but if someone says no you're not going to force them at staffpoint.

Conscript armies have enough problems as it is, and Wardens are both the police force and the army of the White Council.  Your most combat-powerful wizards are not the people you want bitter about having been press-ganged into risking their lives.  Ultimately the sort of missions the wardens undertake simply can't be done by people who aren't doing it voluntarily.

Could Evocation be used to attack a vampire's hunger stress track directly?  It seems to me that Water ought to be able to do it for Red Court and Black Court (as they use physical blood) and Spirit ought to be able to do it for White Court (as they use emotion).  In narrative terms it seems simple enough to describe what you're trying to do, which is to destroy the 'fuel' the vampire is using to power their supernatural abilities.

Do you think it would be defended against with Discipline, or would Endurance or something else be more appropriate?