Not possible.
Redstone is fucked sideways on Olympus. Even if you made a 'lag free' repeater, the game would lag and the clock would lock always on.
If comparators were a thing, we could make impulse activation clocks which cause less lag than repeater clocks.
But there is a shitty piston limit anyways, eventhough hoppers cause more lag.
Maybe next season Redstone will be reasonable.
Anyways, it's better to make a gravity killing mob farm than use any Redstone.