The Direct needs Bt 4.2, ruling out older phones. My s4 mini has 4.0, Ok it’s old, and to be replaced. But they make it look that all android and even non smartphnoes will work.
The aid does not have a2dp protocol fro BT. So no stereo BT. The TV streamer dies airstream protocol, I suppose something like the old streamer protocol.
I tested the OPN1 for 4 month, and that had two ear phone use. And with that in a noisy environment I could still not hear people on the phone. Like in busy office environment, or standing on the street, with passing traffic.
We were used to one ear phone for 100 years. So ne problem with that. Problem with most (Cell) phones it that they have a tiny speaker that doesn’t give sound in the ear direct, and at the HA microphone. My old home phone has a bigger speaker and works better against HA. ITC HA should do best without BT.