I have had success pairing the Plugable USB 4.0 Low Energy Micro Adapter with my Phoneclip+ streamer just to listen to the sound from YouTube videos on my computer.
Two things to check out (for all these devices). Do you have the latest driver? When I first got my Plugable device in April, 2017, the driver that Win10 installed wasn’t the latest available. I got the latest driver from the Plugable website - so I’d check that out for all your devices.
Secondly, I had a lot of problems with connectivity, especially if the computer went to sleep. So if you go into Device Manager, under BT devices, find the adapter, mouse-right click, pick Properties, and see if there is a Power Management tab (there is in Windows 10 Pro). Under that tab, UNCHECK the setting “Allow the computer to turn off this device to save power.” After you do that, you should find the connection rock solid (if you can establish it in the first place!). Before I did that, my BT mouse, for instance, was losing its connectivity all the time when the computer went to sleep. With Win7, you may happily be set on a particular SP version but in the past with Win10, getting “major” feature updates ~every 6 months, during the major upgrade, in typical Microsoft fashion basic settings like this power management feature would be reset to what Microsoft thinks is best for you. (Same is true or used to be true for resetting your boot setup to “Fast Start” - where you’ve essentially hibernated your previous operating settings and using them again to boot rapidly-which I don’t like to do for various reasons). So if you have problems with BT connectivity down the line, check that the BT adapter power management setting hasn’t been changed back in some major MS update.
With the Plugable, I’ve found the driver gets corrupted or whatever from time to time. If I have BT connectivity problems, I go back to Device Manager, pick Update Driver, then proceed to Let Me Choose From List. Device Manager usually shows me the right repository version, and I just reinstall that. In Windows 10 I usually don’t even have to reboot.
Good Luck! Looks like from your audiogram that you need your HA’s and streaming to them for your low-frequency hearing. But since I have good low-frequency hearing and open domes, I much prefer to stream to wireless headphones and listen to the sound through both my HA’s and open domes. Don’t know if you have any wireless headphones but maybe that would be an alternative for you if you can’t get any BT dongles to pair with the PhoneClip+.
BTW, the USB adapters are apparently limited in their capabilities. My Microsoft Surface Headphones work great with all the devices I’ve tried that have BT built into the main system. But when I try to use these BT wireless headphones with my 2011 Gateway NV-59 laptop with the Plugable dongle, although I can stream sound and establish a hands-free stereo headset pairing between headphones and dongle, speak to the computer through the headphone microphones, I get a warning if I try to use Cortana through the headphones that my computer isn’t compatible with the headphones. So apparently USB-supplied BT is limited in its capabilities beyond the power management issue.