Concerning EQ or PEQ, shouldn't a competent software with built in profiles (like SoundSource on Mac) do the job easily?
I already know you won't like that answer, but unfortunately at higher frequencies you're facing sample variation (including pad wear issues), and inter (between different people) and intra (for the same person, seating the headphones in different ways over one' head) individual coupling variations that make EQing headphones quite difficult (without even considering HRTF differences possibly requiring the ideal target to be slightly different between listeners).
What is often done is to perform spatial averaging on ear simulator fixtures to try to identify the invariant peaks / dips from the ones that may vary because of positional / coupling variation. Baring gross sample variation issues, these invariant peaks can be quite safely EQed down with somewhat narrow Q filters, as it is reasonable to presume that most people will experience them at the same frequency (ex : Focal headphones' 6kHz or so peak).
That's the basis behind presenting the data in this way with confidence interval, here from Oratory1990 :
Peaks / dips that vary with fit over the fixture may turn out to present themselves in a significantly different way once they're on your head, and using ear simulator measurements to EQ them might not bring ideal results then.
In the example above it's probably a good idea to leave some room for individual tweaks to the preset above 1.5kHz.
Presets such as the ones you'll find in SoundSource (which are derived from the autoEQ project) are a good starting point, but won't "easily" address some of the issues you may experience with Beyerdynamic headphones, particularly in the treble range.
I'm not quite certain that you'll be interested but I can send you the PDF of some (paywalled) relevant articles on the subject. This one is free (but unfortunately doesn't feature more modern HP designs) :
https://vbn.aau.dk/ws/portalfiles/portal/227875204/1995_M_ller_et_al_AES_Journal_b.pdf