Not suggesting that it's safe (nor that it isn't) but that if you are going to do it be sure to up the water intake.
Medication induced cholestasis seems to be more a physical issue with the movement of the bile, rather than with the specific metabolic enzyme pathways that we usually concern ourselves with when questioning the concomitant use of other substances with kava.
For that I would be taking things that help with bile flow, like lemon water first thing in the morning, milk thistle, turmeric, gold coin grass, etc.