You can't "lock" something that doesn't exist.

[DumdogsWorld]

This may seem unrelated at first...but....I remember when I tried making some custom races for Skyrim via modding. I wanted to do something a little different than the rest of the race mods that existed. I wanted to make a playable race that wasn't a humanoid with a custom head and tail. I wanted a race that was actually more...beastly.

Rearrange the vertices in existing 3D models to make the proportions and poses different? That went smoothly.

Re-texturing the models so it doesn't look like they were simply stretched out? That went smoothly.

Making new animations? It took a long, long time, but it went smoothly.

Re-doing the armors/clothing in the game to match the new body structure of the race? That took even longer, but it went smoothly.

All of the individual tasks that I had to go through went rather smoothly, despite being time consuming.

So how did it turn out?

It was a consistency nightmare. Clipping. Clipping everywhere!

And things worse than clipping. Animation bugs. The game had virtually no cutscenes, but the ones that existed completely broke.

Forget riding on a horse.

Forget....um...playing the game!

Now back to talking about FFXIV:

Things may seem easy on paper, but half of the time, the real effort is in the "glue" that holds things together. This isn't Skyrim and Bethesda we're talking about, either. It's FFXIV and Square Enix. Things that other companies get away with would never work here. Players have brain aneurysms over miqo'te tail clipping.

Square Enix can make it happen, but even if it does happen, it's going to take effort and time. Save your fantasias for later.