I used to get hit with it 6 to 8 times per year. I started eating yogurt with live and active cultures and it pretty much disappeared. It only has happened a couple times in the past 5 years while traveling and not on my regular diet of live and active cultures. I currently consume kefir instead and that works as well.
I’ve only had 2 bouts of diverticulitis but the second one had me in the hospital for 3 days on IV antibiotics. Like you, kefir in now my morning drink. Knock wood it seems to be helping.