Ask HN: How do you deal with feature flag cleanup?

I work for a startup and as we grow we are increasingly depending on feature flags for releases.

One of the side-effects that come with more feature flag(FF) use is the FF cleanup burden. I was curious if anyone has developed any tooling that makes this cleanup easier and automated?

I know there's the obvious candidate of creating a clean up ticket as part story(or whatever equivalent) conclusion, but i'd like to see if cleanup is solvable via automation as opposed to process.

An idea I have is for every merge to main, check to see if any feature flags have been added. For every feature flag added, create a "cleanup PR" per added flag that removes the feature flag and check, removes the old functionality, and persists the new functionality.

I recognize that this solution design could be pretty specific to how my team uses feature-flags.

Any feedback on a tool that works like I described or are do you think there's an alternative approach I should consider?