This may be down to personal preference, but I keep my studio monitors flat - even though I have about 3dB [subjective] hearing loss above about 6kHz in one ear. It was caused by illness, not by sitting too close to front of house for decades.
I compensate by turning my head periodically if I need more detail, rather than upsetting the sound of the room [for me or anyone else].
I always hear that way, so if I'm listening to someone else's work, I still hear it that way. After 20 years, I'm just kind of used to it.
There's nothing worse than going to a low-budget live gig with a half-deaf sound engineer who cranks up all the high end because he can no longer hear it. I'd say you should do the same in the studio, listen flat, learn what flat sounds like even with compromised hearing.
You have to mix to what everybody else's material sounds like, not what you'd like things to sound like because your hearing is compromised. If it's so compromised that you no longer can tell at all - then it's time to retire, or hire another engineer.