Unfortunately, while I loved that Batman series, I can't do any Batman skins because I don't have a model for Batman (the ears make it really unique and hard to do on any other model).
It IS hard to find an adequate model for Batman. It is not impossible, however. I think the Black Panther model COULD work. It has small ears, but so do some of the costumes of the Batman. For instance, the Batman from the animated series "The Batman".
Black Panther's Ceremonial and Holy Armor skins could make for some interesting skins. I wouldn't recommend the Classic Black Panther (the one without cape), and I'll say why later. Wolverine's Astonishing and Classic models, if skinned correctly, might also work. From the front, the ears appear to start in his facemask. When looked carefully, they are actually popping from the sides. His claws wouldn't be a problem, since they are boltons.
The cape could be a bolton. There are one or two cape boltons around in this forum - there's a XML1 PS2 Magneto cape. It's red however. Some modder could either give it a shot on making a proper Batman cape, or at least on recoloring the cape. I've tried to recolor the cape, but haven't figured out a way to recolor boltons. Some of the other modders should know how.
It's just some insight worth considering. You might at least check them out. You never know.