I'm not a wearer of hearing aids. I can hear fairly well but I do have constant tinnitus and a noticeable attinuation of the higher frequencies. Mostly from my abuse of my .357 magnum pistol without proper hearing protection and the volume knob on my amplifier with full knowledge and consent, in various bands in the past.

My biggest problem is understanding audio from movies and some speech under certain circumstances. Those highs are missing.

One of my concerns is when mixing that I'm treating the high end of the mix incorrectly.

I'm going to look at that Hear plug in. It's similar, I suppose, in nature, apparently, to the ARC room correction software that "listens to the room" and adjusts the speaker output accordingly to allow you to hear the mix with accuracy.
I have ARC but haven't taken the time to run it on the Kill Branch room. I need to get off my lazy butt and make it happen.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.