If they add Ivalician Moogles to FFXIV, there's a perfect setup for their existence.

[Iscah]

I was thinking more of a beast tribe race like the Bangaa if we return to Ivalice in a later expansion.

Yes, it would be much more likely to see them as a beast tribe than playable. No need for gear compatibility, no lore clashes because we don't meet them until after Endwalker.