I have Avid speed dial levers-replaced from my XT shifter/brake pods when I went with a new Sram X9 drivetrain. If those Shimmy levers have the same adjustability as the speed dials, your golden.
One other piece of advice, I run Power Cordz cables with my mech disc's. Absolutely no stretch, and awesome modulation. Those cables really make a huge difference over standard cables.