Unlikely they add many if any male viera as NPCs. Two examples of similar situations, male miquote are about as rare in distribution as male viera, and when you look at the number of male miquote as NPCs we interact with for quests, I can only think of two. The one in Peering Stones trying to ready himself to take lead of the tribe or whatever his story was... it's been 4 years now so I've forgotten exactly. And the Crystal Exarch. Additionally duskwight elezen as another example are rare to encounter above ground, and that's well reflected in our NPCs with only very few appearing out and about (at least on the Source)
They tend to stick to the lore when it comes to who lives where, and in what distribution, so I wouldn't be surprised if there's maybe only 1 male viera we encounter as an NPC in all of Endwalker.












