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Regarding an Oberon cylinder working with your lever; It partly depends on the diameter of the piston in your new lever and also how much adjustment to the mechanical advantage of the lever is available.
You already have it set up on a standard slave so that should give you some idea.
The Oberon works to give a lighter feeling clutch action, by virtue of the larger piston size... 29mm on the Oberon. (sorry don't know what the standard one is, but it is a bit smaller.)
Your standard master was probably 12mm 12.7 or 13mm. I'm guessing that your new one will be 16 or even 19mm. If that is the case it will give you less mechanical advantage and a heavier clutch pull. But it could be that you can compensate that by adjusting the mechanical advantage of the lever upon the piston.
Note that when you increase the mechanical advantage, you also reduce the amount of clutch lift. In other words more lever movement to slave movement.
Vice-versa when you decrease the mech adv.
So try your lever and see if it is heavier or lighter than before, and that you are achieving no less than 2mm clutch lift. Maybe after playing with any adjustment on the lever.
From that starting point you can say that an Oberon will give slightly less lift and a slightly lighter pull.
Factory Racing slaves use a 31mm piston, so will give an even lighter clutch but less lift.
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