I always felt like batman would always feel a bit third wheel around the justice league, especially in direct confrontation against metahumans. Darkclaw, would be Bruce giving up on his humanity and altering his body with nanites, lacing his bones with some superstructure, having nano healers in his blood and amplifiers/direct feed from his senses to his cave supercomputer (chemical analysis smell and taste, voice recognition and noise removal earing, telescopic and microscopic eyes). His claws would not be cybernetic but part of the costume, he would have many on his gloves, that could be used as claws or projected like batarangs .
