You can use ImgBurn to rip the disc to an ISO on your HDD, and then burn that ISO onto other DVDs. This won't work with copy-protected discs, but will do just fine for everything else.
I would honestly just get an 8-pin adapter and not risk it. I have worked on a lot of computers, but I have never even attempted that before, so if someone else has and knows if it works or not, I would be interested in knowing. I am assuming it won't work, personally. The voltage probably wouldn't be right.