I think you are underestimating the amount of force required to move the Master.
Having bench-bled a removed slave/master, I can tell you that it takes some considerable force to stroke the master. I'm talking Popeye forearms unless you gain some serious mechanical advantage.
I'm thinking something along the lines of a motorcycle front brake hydraulic system. Key is to find one that would provide enough flow and pressure to fully stroke the slave. Not to mention orienting it such that its reservoir is upright.
I'm not aware of any hydraulic motorcycle clutches, but that might be a better option.
If anyone else will be driving it, you may want to consider T-ing into the existing hydraulic clutch system so the clutch pedal remains functional.
You might find some fabrication assistance for something like that over on Pirate4x4. I would not post that in ChitChat.