Make the Animation panel's 'record mode' record another property.

Context :

So I whipped up a rudimentary bone system consisting of a script, which upon addition to a GameObject, displays in the scene view a handle attached to it, which is to be dragged around to achieve rotation more easily.

This script has a property HandlePosition, which stores the position of the handle and is used to rotate the sprite accordingly. Its rotation gets updated by the script when the handle is moved.

I use it as follows : With the Animation Panel in record mode, I drag around my handles to rotate the objects they're attached to. The changes are recorded in the animation and my rotations interpolate successfully.

Problem :

The property being recorded is HandlePosition, not transform.rotation. This behaviour is to be expected, since I actually change HandlePosition; but it is not the desired outcome.

I would like transform.rotation to be recorded instead, so my animations still work if I remove the script.