[1.20.2] Transform a removed mod item into another one on mod update

Hi  I'm developing a vanilla-based mod, where I add a bunch of new blocks based on vanilla materials. Sometime these variations gets added into the base game, so I have to remove them from the mod to avoid having both items (an example is the lantern or the copper grates that will be added in 1.21).

Now, every time this happen the player looses their item in a previously saved world, which is of course not cool.

So I was wondering how can I handle those cases, so that when the player loads in a world with a new mod version that doesn't have that item I can somehow transform that into another item (like a vanilla one in this case)?