Sram/Sachs made a front mech, both standard pull not 1to1 ratio, so Shimano compatible. Sram had a 9.0 to compliment the 9.0/9.0sl drivetrain as well as 7.0 etc..If sram supply you with a 3 speed lh shifter then what front mech are you to use? Just a Sachs quartz one? Or Shimano?
And would you just use a Shimano cassette ?