Sooooo… I am very sorry, I didn’t know this (just learned it). You were right! Hearing aids actually DO use a proprietary connection to talk to phones. It’s still technically part of Bluetooth LE (low-energy), but Apple and Google made proprietary extensions to standard Bluetooth: For Apple, it’s part of their MFi (“Made for iPhone”) program and for Google it’s ASHA. Neither one will work with a Windows PC Some recent Macs do support MFi, but that doesn’t help you here.
So you’ve correctly identified your options:
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You can use a device like the Oticon ConnectClip, which handles the connection between itself and your hearing aid, and then relays that to your Windows PC via traditional Bluetooth (which is what your USB dongle does). Seems to be $200+ though
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Or, yes, you can try to find a way to stream audio from your PC to your phone and do it that way.
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There is a third way, but it’s risky: Some versions of Windows support Bluetooth LE audio streaming to some hearing aids, which is a cheaper way to do this than the official ConnectClip (but it’s one-way, only for listening for computer audio and not talking to it). But it’s not clear to me if your Oticon Real (or any other model, except maybe the newest Intent) supports this… their website is indeed terrible (and seemingly going through some updates, so a lot of the Google results are wrong right now). You’d also need a compatible special kind of Bluetooth dongle, which I don’t think the TP-Link one is… it’d be something like this Avantree one or this other one. But that’s a lot of “maybes” for something that might not work at all.
None of these are great options. Hopefully if you find an app that works for streaming audio to your phone via Windows directly… that would probably be the cheapest
I had no idea the hearing aid Bluetooth situation was so complicated Sorry, OP!