Received the OG Duo yesterday but have a few questions

So, first off, wow this thing is amazing. I have zero issues so far with the Duo. None of the problems I've seen mentioned so far. Performance wise, I'm coming from a Samsung S10 and I see nothing but great things with the Duo.

I do have a few questions however. My hearing is not so good (thank you US Navy) and I wear hearing aids. Now, this is a blessing in disguise. These are the best bluetooth ear buds I've ever tried. My issue is. I'd like to pair them for audio and use my Gear S3 watch for caller ID and data display. I'm not sure I'm doing this correctly though. On the S10, when I pair my hearing aids it indicates they are being used for audio and data. Great, I can pair the watch for data and the hearing aids for audio. On the Surface though, it's different. It lists Phone calls (I assume audio), Media Audio and Contact sharing. How do I make sure all audio goes to my hearing aids and I can use the watch to see caller ID/text message info?

On that note, the Galaxy Wearable app I have on the Duo will not launch. It simply stays there with a start button and, when clicked, does nothing. It indicates I should connect a watch or similar item but I've got it connected already and nothing happens. Any ideas?

I'd be very grateful for any help with this. Thanks in advance.