Smoke removal from Cabriolet headliner

I'm the new owner of my Father-In-Laws 2016 A5 Cab and while he wasn't a heavy smoker, his car was where he smoked the most and it's bad. Any suggestions on how to safely clean the white headliner in this car? I've seen a few enzyme cleaner options, but due to the delicacy of these headliners, I don't want to do anything to cause saggging down the road.

My plan is a full interior detail including removing the seats to shampoo the carpets. Steaming everything I can and an Ozone...

Smoke removal from Cabriolet headliner