I built Bake Atlas Composer for Blender for this workflow: Artists otherwise duplicate objects, coordinate non-overlapping UVs, prepare image nodes, sequence bakes, and rebuild one shared material by hand.
Result: Select a prop set, preview isolated duplicates with a shared atlas layout, then generate one baked PNG and shared material inside Blender.
Tested in the target app; compatibility and limits are documented. Commercial product by the maker: https://dat398.gumroad.com/l/hrhfhh?utm_source=blender_artists&utm_medium=community&utm_campaign=blender_bake_atlas_composer&utm_content=launch