Really? You just described a KDF, and advised people to use it without providing any references to implementations. "Just leave out k bits of salt and brute-for

Really? You just described a KDF, and advised people to use it without providing any references to implementations. "Just leave out k bits of salt and brute-force it" -- do you really expect non-cryptographers to be able to correctly implement this algorithm? If you insist on using hashes, at least you could tell people to use PBKDF2 to turn a standard hash into KDF.