CI Move Anchor is a script from Creative Impatience for After Effects that repositions a layer's anchor point wherever you want while retaining the existing animation path.
The controls live on the script panel and follow three steps. You press the Save button, move the anchor point anywhere you want using the Pan Behind tool, then press the Move button. The anchor lands in its new position and the animation path is preserved.
Version 2.0 added support for 3D layers and separated coordinates. The script runs across a wide span of After Effects releases, from CS5 and CS6 through CC and the yearly versions up to After Effects 2026. It is listed here as free, and a demo video is available on the developer's page.