I realize this wouldn't be optimal for detailed meshes, but it would certainly be useful for creating others.
Sometimes I have meshes I'd like to join together, only I'd like them to interact as if they were metas.
One Meta from Mesh Exterior?
Since metas look similar to a remesh modifier with low poly, couldn't the add-on just lower the poly count as much as necessary (and only use the object outline as a guide) before converting to meta?
Multiple Metas as One?
The answer to this question: "Are there any non-standard meta objects available?" says it's not possible with python programming but suggests there may be a work around if the shape is composed using many meatballs. I feel there must be some other reason a "convert to meta" add-on isn't available.