Smaller shifting cylinder

[asid61]

I'm working on a shifting gearbox design with two gears on the CIM that go directly to the shifting gears. I'm running into an issue where the CIM is too close to the shifter shaft, so I can't easily fit a regular Vex pancake cylinder there. I was going to swap it out for a 3/4" bore round body cylinder, but the mounting nut on that one is too large and hits the CIM. Is it feasible to use a 9/16" bore cylinder in place of the 3/4" bore? According to my calculation its force output is 16lbs compared to the 3/4" bore's 27lbs, but this is also on the first stage of the gearbox so the force required to shift should be less (there's a 2:1 reduction happening after the shifter).