Male Viera as a playable character! show your support

[Allegor]

Only if it's as NPCs and not as potential playable races. If the latter, then it just causes story issues to arise (why and how did someone from the First come to the Source before all this travel stuff became common knowledge to the players character?).

Same as why would Yugiri hide her face in fear Eorzea would freak out at the sight of an Au ra....while talking to an Au ra /shrug

And even though it's non canon, they could use the same excuse as the FFXIV x FFXV crossover did - randomly being spirited away by some portal.