I'm sorry to say that don't like this idea. You want a limited job where you'll mishmash actions from other jobs regardless of type. What I read there is that you want an "I win" button.

On top of that, jobs like Blue Mage and even Beast Master can stand on their own regardless of their limited status. Their lore, their quests, their in-game reason for existing. What you want has no such thing and personally I hope they never do such a shoddy and rather lazy design attempt of a job.

And no, I don't need incentives to play the various jobs. I play because I have fun with them.