My hearing falls off a cliff at 2khz due to many years standing next to a hard hitting drummer in punk bands.
I have expensive aids and they make a huge positive difference. A good audiologist will also make a world of difference.
Ear canal only aids are usually only prescribed for full frequency loss, if you’re only deficient in certain frequencies then your losing out by pumping all of your hearing through the aid.
I had multiple tuning sessions for mine and they work fantastically. On first putting them on it can seem a bit intense but after a few minutes it’s all fine and sounds normal (I expect) when I take them out it really feels like I’ve stuck my fingers in my ears.
Mine are Starkey and I chose that brand as they were recommended by other musicians.
Ps £3k