If memory serves me right, yes. All Shimmy (and shimmy clones) have backwards compatibility with 1-speed-down pull ratios.
Read about "Shimergo" solution.
Instead of feeding the derailleur cable straight into the clamp bolt you need to turn the clamp 90 degrees and feed the cable around it. This trick adjusts your current shimmy pull ratio to the previous Shimmy spec.
Interestingly, you can also use campy shifters with shimmy cage/cassette, which is Shimergo is all about. Again, if memory doesn't fail me, 10sp campy is the same ratio as 8sp shimmy, and 9sp Campy is same as 7sp Shimmy.
I've been running 10sp campy brifters with 9sp shimmy cage&cassette for thousands of miles and it works like a dream - better than shimmy with shimmy.
