There is a way, but that's a little beyond my expertise. Actually, it's in a completely different universe. But maybe PM someone who does. I can recommend ImCoKeMan, only because I noticed him saying he could help dump a ROM before and I believe he's had a 6700 before.
http://forum.ppcgeeks.com/member.php?u=3923
He talked about the same thing at the top of this thread, albeit for a different phone. Just click on his avatar and you'll see the link on the right side of the page to PM him. Good Luck!