Meshpart to primitive part conversion/import?

Is there any conceivable way to automatically turn mesh parts or mesh data into primitive parts? I know the City loader plugin turns the building information from maps into parts, so I think the basis is there.

The goal is to make the blocking of this city into primitive parts so I can freely edit them in studio to make a city. This is important to workflow and my development cycle as a whole.

My meshes

City loader plugin