I'm on my 3rd hearing aid and unfortunately they haven't gotten much better for me in the past ten years, dispute the claims the technology has gotten so much better. I think it's because the signal processing challenges for single sided hearing loss is totally different for bilateral hearing loss. It's also a much smaller and there for under prioritized market segment.
I'd be interested in a hearing aid project based on pinebuds pro https://pine64.com/product/pinebuds-pro-open-firmware-capabl...