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It's a one dimensional problem. No need to invent degrees of freedom when a good solution exists in EQ provided you take into account non-FR related issues like distortion for your headphones.
It isn't one-dimensional. The degrees of freedom are frequency, phase, and amplitude. Some basics are covered in the video on his page (I have no association with the authors, just trying to share useful info for you to learn if you care to do so)...
https://www.sageaudio.com/blog/mastering/what-is-stereo-imaging.php