I've found that the right shiftmate will cover just about any combination. for your situation the shiftmate 4 should do the trick. if in the future you need a different combination, you can just order a new cable cam.
I'm running 9sp shifters with an old DuraAce der. it's not supposed to work, but with the right shiftmate combo it works fine. go to
www.jtekengineering.com/shiftmate.htm