I have also found the Apple Headphone Accommodations to be the best solution because it adjusts the audio to your audiogram. This would seem to meet all of the requirements of the OP. I use AirPods Pro 2 that have the changeable, multiple sized ear tips. On the iPhone, go to Settings > Accessibility > Audio/Visual > Headphone Accommodations > turn “On” > Custom Audio Setup (under “Tune Audio For” check “Audiogram”) > Add Audiogram. You can try to import a photo of your audiogram and then adjust the values manually when that does not work.
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