Bluetooth is for streaming Audio. You are not streaming Audio.
Here's a clip from a DIY School Hearing Aids (v2.2) PDF File named (02 How to Program your Hearing Aids);
Step 2 - Purchase a hearing aid programming device
For DIY self programming you will need a hearing aid programming device/hardware. You cannot use Remote fitting. Please read a DIY School file named (01 Free Hearing Aid Fitting Software) as to why.
Selecting the correct programming device is not a trivial step because older/legacy hearing aids use cables and such to connect the hearing aid programming device to the hearing aids. In order to avoid Noahlink Wireless driver problems, try installing the fitting software first (before plugging in your programming device) If you do encounter Noahlink Wireless driver problems, read a DIY School PDF file named (Noahlink Wireless - Instructions For Use) and scroll down to a section named (Noahlink Wireless Driver Errors).