Hi ! Maybe I'm not reading what you say properly (again still need to practice my english XD) but there is something that make me have some doubt

Indeed, you are looking for mentions of male Vii and if male are still alive or totally wiped out by sin eaters. But, at least in the french traduction, they are said to be alive, just a very few left. Early on when we arrive in the village and the vii explain their situation, the fact that they are almost extinct, they said there is not enough male viera left BUT with that statement they said they are alive. And more than that they also mention the fact that they are also protecting the forest.
But again, maybe you already know all that and I didn't understand what you were saying, sorry XD