Hi Frank.
I am only an user. For me bluetooth would be fine because I have a Dali Zensor 1 AX (active speaker). I have built a Telefunken Transistor radio where a Rasperry pi 3 is placed in (Sure RuneAudio is the Software
). The original speaker (very small Transistor-radio speaker) runs with a Hifiberry. But the Dali Zensor 1 AX has bluetooth. So if I could switch between original speaker and bluetooth I could send the signal to the Dali speakers. That was the idea. If it is necessary is another discussion.
You have asked in a post above to tell you how to implement it. Unfortunately I am not a Linux - specialist (only an user of Mint Linux) and cannot help you actively. But I have found the link above. And I thought it could be useful for you to get this information, because there was someone who has already tried to implement it. In any case there is no harm to inform you about this link
.
Greets
Bergfex