Good questions, hopefully someone will be able to shed some lights as I have the same! So far my experience with BCR hasn't been great. Can't get redirect working well with even YouTube when I do server fetch via proxy.
I was thinking if we do only audio, do we really need BCR or will the HDX standard audio redirect be good enough.
I'll do some tests if I can get this bloody BCR working, I'm on VDA 2203 CU2 on w2016.