I feel like if you want to make the Gale/Lotus/Adamantite (Wind/Fire/Earth) stances work in current XIV, you would need to make each rotationally useful and more impactful within the Greased Lightning mechanic. You could also vary Howling Fist and Steel Peak in the same way that Shoulder Tackle was via Tackle Mastery, but unless the effects are more diverse than its were, I doubt that would feel satisfying.

Assuming necessary changes to base potencies, let's say that:
- FIRE increases Damage by 5%, Critical Strike Chance by 10%, Critical Strike Bonus by 15%.
- WIND increases Attack Speed by 5%, Movement Speed by 15%, and Haste by 20% [Reduces recast times of damaging abilities].
- Earth increases Attack Power by 5%, reduces damage taken by 10%, increases the speed at which negative effects fade by 33% and reduces the rate at which positive effects fade by 33% (continuous additional drain / reduction of drain over duration).

This means that Wind offers nearly the same damage increase as Fire, while Earth comes in at a close third that doubles up by improving, indirectly, Second Wind.

Now, let's take Greased Lightning. Imagine the UI ring of 5 Chakra, but this time including Greased Lightning as a trio between the 5. Each orb of Chakra takes on a different color and internal sign, for Wind, Earth, or Fire.
The base benefits of Greased Lightning are roughly halved. Each increases all stat modifiers (Attack Power, Defense, Magic Defense, Critical Strike Chance, Critical Strike Bonus, Attack Speed, Movement Speed, and Haste [which reduces the recast time of abilities]) by 3% each. But they also each carry half the benefits of the stance used when the Greased Lightning was generated, and [tentative idea] a consumable Essence (of Wind/Fire/Air), consumable by certain abilities.

[Tentative] The point of these Essence is to provide bankable resources for tactical adjustment to play. An Essence of Wind, for example, allows you to ignore up to a certain amount of a given remaining damaging ability's cooldown (percentile reduction per Essence based on total cooldown*potency), accelerating it, making it useful for doubling up on Shoulder Tackle or chaining stuns. Preparing enough Wind Essence to ready oneself for an incoming event where fitting an additional damaging CD (say, Elixir Field) into a window would outweigh the general modifier given by Fire Essence or for needed movement or utility, for example, could make the difference between a decent Monk and a very good one.