Python scripts for Blender provides operators that moves all objects in the scene to the center. Invert Normals - invert all selected objects normals.
Copy startup.py to 'C:\Users\user\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\startup' (for Windows users)
After installation, operators are available in Blender's F3 menu
Invert Normals shortkey is CTRL+ALT+SHIFT+F
The script applies any transformations (location, rotation, scale) to each object.
For each object, it calculates the minimum and maximum x, y, and z coordinates of the object's vertices. These values are used to move the object to the center of the scene.
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.