An aftermarket slave cylinder with a bigger dia piston wiil reduce the effort required at the lever by an amount proportional to the increased piston area. So yes, the Oberon should be effective, though I'm not familiar with your particular clutch, but that's what I'd do on mine. And Oberon stuff is decent.
The short levers will probably have very little effect at all, but if anything they'll make things worse as they offer less leverage. Most people probably grab short or long levers in roughly the same place anyway, but theoretically the longer ones would give a lighter action if you grabbed them right at their end. The downside of this though is the extra stretch of the fingers.
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