It's not really an useful way to do this. Any website that offers this could scam you (anyone that knows your priv key can steal from you). A vanity gen based on fingerprint and password would have to run on a computer. And then you'll have to rely on a 3rd party app (prolly on your phone / tablet) that will read the fingerprint, then transfer that data on the computer where another program will take that data to generate the "private key". Who would use that?!