Darn, it really doesn't look like there are any implementations other than the one you provided and maybe some for RSA. There are a
bunch of
papers for blinded signatures with various DSA signature schemes. Still that would require hiring a cryptography expert to actually implement that properly. Seems like BitShares Vote isn't coming anytime soon.
Edit:
Hmm, I found this paper and apparently someone has attempted to implement the cryptography in that paper in Go over here which seems like a very simple implementation. After actually reading through it, I wouldn't trust that paper.