I got hearing aids, too and have the same issues. Regarding this I wrote following Email to Fairphone support but apart from an automatic message I´m still waiting for a reply:
Hello everyone!
Related to the topic “(feature request) dual audio support (BT 5.0) = how to recycle old bluetooth speakers” I want to mention another use case for dual audio:
I´m wearing hearing aids, which I connect via BT to my FP3. The HAs put the sound in my ears like any audio plug, too and at the same time the HAs are using their own microfone for recording my speach.
But here is actually the problem:
If I connect the HAs to the FP3, this is the only connection. There is no way to use the HAs only for hearing and at the same time to connect another microfone for speaking.
This is ok in a very quiet environment but as soon you are on the street, at work or in a bar nobody can understand you anymore since the microfones of the HAs are always focussed in front of you (of course, since they are made to record sounds like that).
So, the use case is to hear sound on one BT connection and speak on another connection.
This is actually bothering me for years now. I don´t have that problem on my computer since it´s very easy to decide myself in the (Windows) audio settings which hardware I want to use for sound in and which for sound out.
Is there a solution for this? Or is something planned?
Other than this issue with the dual connection:
I´ve read the topic “FP3+ & FP4 hearing aids and direct streaming” and since I´m going to buy new hearing aids soon and want to stay with Fairphone (I started with FP2), I´m really interested in any progress in this direction. Right now it looks quite bad, from the information in this topic.
Depending on what hearing aids I´ll buy in the end (it´s not about what I like but what works best for me) I will or I will not buy the FP4 (FP5). Since I will use these hearing aids for at least 6 years, I might not even buy the FP6 and FP7 if they don´t support connections to my hearing aids.
It would be nice if you can tell me something positive regarding these issues.
I´ll keep you updated about what Fairphone Support is going to answer to this question.