The thing is it isn’t “just copying over” and would still involve work both on automating the build process and integrating this in to the app (you definitely don’t want to parse all root certs on startup). But yes if the situation degrades faster than expected for the impacted devices this would be a possible option.

How would you stop that essentially being doing Overtures cleanup for them?

Adding actually missing POIs is on the other hand trivial, just get the Overture data as GeoJSON and off you go, but as said potentially on a wild goose chase.