FreeMoveHandles in custom window?

Hi,

I have developed a method of moving handles that I draw inside of a custom window using the mouse.

It is getting a bit out of hand. I am curious if anyone knows of a way to use Handles.FreeMoveHandle to adjust the value of a vector2 or Vector3 all inside my window.

The class seems like it must be tied to an actual gameObject but as far as I can tell those cannot live solely inside my window. I am making a plot editor inside of a custom window script. I do not want to do anything at all to the scene.

Any insight would be much appreciated.