Elliot, the way you handled the changes is perfectly acceptable. None of the proposed options is game breaking, since they all seem to be fairly one for one trades, or at least close enough to it, that it doesn't upset the balance of the game.
So your propsed solution is more difficult, requires the reworking of an entire class. In addition to creating a new maneuver, you also have stated more or less that the player should select Tiger Claw, which does not have the same supernatural area attacks that Desert Wind has? I'm really failing to see where you came up with all that, it also is extremely cumbersome compared to just switching out the element the spell has, or the primary skill for a discipline. The proposed fixes are literal 1 for 1 exchanges. Yours involves a hell of a lot of work, for little to no payoff.