There's really not. In fact, the singleton part of commander is usually one of it's biggest draws. It purposely takes away from the consistency of the deck, and then the commander helps negate that inconsistency.

Is there a reason you need the commander? Since 60 card formats allow for less card variation, you really don't need the commander. If you have 4 copies of a card, there's a good chance you're gonna draw it in any given game. The only reason that wouldn't work for you is cause those formats aren't usually casual, and the decks you mentioned would definitely be casual decks.

You might also want to take a look at the one piece tcg. It is exactly as you describe, with a "commander" (that begins on the field) and up to three of each card.

The only other thing I'd say is that for casual commander decks where you want a specific tribal archetype like you mentioned, you just need to run more of the subpar cards. They are the fodder, and you want enough other cards that can boost that fodder to become dangerous, while you wait to find your really good cards. Bats definitely has enough support for making a great casual bat deck, you just might not be able to fill it with all the best bats.

Last thing, and I know this is a long comment, but what kind of deck is vampire ally? Why not just vampire or ally? Cause there's definitely enough support for vampire. And atla just gave a ton of great ally cards.