Some tentative thoughts:

What kind of center/centre is being sought?

Bounding box center may not find the desired center. Nor CenterAtOrigin script.

Centroid finding may require some integration, or calculations involving many points.

Prior center of mass/ centroid results: https://moi3d.com/forum/index.php?webtag=MOI&msg=9270.16

The area.js script that I have does not work in MoI4Beta.

- Brian