Using ASIC for password cracking - mad concept?
It will not help even if passwords were hashed with DSHA256. This link explains why. https://rya.nc/asic-cracking.html

Basically the ASIC loads the header into its memory and increments the nonce until the hash of the header is lower than the the specified target.

Therefore you cannot use this to brute force a password seeing as the logic is incompatible.