The problem with that scenario is that now you're balancing a job twice for half the potential game play. So no, that's simply not feasible.

The decisions pretty much been made on this issue, and FFXImongers keep thinking if they rock the boat enough it'll matter any.

Problem is, they're still outweighed by those who truly want a Kain style dragoon. And no amount of lore-bashing or 'hail 2.0 will solve all our problems' will change that.

The best way to have your cake and eat it too in this case is to create a battle-mount like Chocobos and Magitek Armor, as I sated on this issue a year ago. This way it has no impact on the job's performance what so ever, can be balanced as it's own independent element in the game, and keep those who do not want to deal with a wyvern pet far and away from the possibility.

This request is being done for aesthetic reasons only, and does not merit a job rewrite even an optional one. That's too many man hours to redo work that's already been done when the request can be met by other means currently in development.