I am against the idea of elemental glamours for Black Mage that involve switching spell animations with one another. The primary reason is from the perspective of a game designer, this makes Black Mage animations send confusing messages. For example, say you cast Thunder III glamoured to Fire III on an enemy. When I target that enemy, would that enemy have the Thunder damage over time debuff? Would players have Astral Thunder III- then how would these icons look? From the perspective of every player except the Black Mage himself, they would be very confused which stance a Black Mage is in and which spells he is actually casting.

Spell glamouring is a thing I can see happening and being implemented, but not by switching your elements because players will be fundamentally confused by conflicting information. I believe that if we were to implement animation glamouring, it would involving something like adding effects to existing animations or changing the colors of existing spells.