[tproxy] Tproxy + DNS + OpenDNS = Borked

Hey Guys, After getting tproxy running on a server that handles a dozen or so of our clients I've run into an interesting problem that I'm having issue with fixing. Some of our clients use openDNS to filter porn websites but when TPROXY is in use they client can still access it, I've figured out that its because the TPROXY server is looking up the DNS directly, I cant change the server to use openDNS with the clients account because a number of clients using openDNS use it aswell. Is there anyway to get squid and TPROXY to spoof DNS requests to show as coming from the client IP and not cache the result? Cheers Tristram