Wow what are the odds you stumble across this thread! I've done several proffessional hearing tests which all basically say the same thing that after about 2000Hz I have moderate-severe hearing loss all the way down to ~85DB.
I believe i'm actually covered under the (Australian) gov. scheme and can get a free pair of these Audeara headphones which do exactly what I want but within the headphones, so It works on any device you use it with. Have a look at it here, https://audeara.com/