Depending on the chain geometry sometimes you can fit a stationary roller/guide block that will control slack at full droop and as the suspension compresses and the chain tightens it lifts up from the roller reducing the amount of pressure until at full bump it may be just off the roller, but with little slack needing to be controlled. You may have to experiment a bit with the height/fore-aft location of the roller until you find the sweet spot where it works best.
Aftermarket rollers with bearings are readily available as replacements for the OEM rollers on modern dirt bikes.
cheers,
Michael

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